From f5f5edb889780392ea419931f16d00b230fe031b Mon Sep 17 00:00:00 2001
From: "D.E. Akers" <0x0dea@gmail.com>
Date: Sat, 15 Aug 2015 19:43:05 -0400
Subject: [PATCH] relax numeric conversions from string

The spec does not establish any particular constraints to observe in
casting from `YARN` to `NUMB(A)R`. Presently, `lci` checks that the
string consists only of numeric characters prior to attempting the
conversion, halting with an error if it's found not to be the case.

This behavior is often more inconvenient than helpful. Many numeric
strings encountered in the wild are "roughly numeric", and it would be
wise to account for this observation. As a simple example, a user may
be prompted to input a number; in the case of their inadvertently
providing leading or trailing whitespace, a naive program will crash
rather than gracefully extracting the otherwise sensible input.

This patch removes the `isDecString()` function and instead leverages
the `strtoll()` and `strtof()` functions to handle casts from `YARN`
to `NUMBR` and `NUMBAR`, respectively. Thus, strings to be converted
are permitted to contain leading whitespace, and trailing non-numeric
characters are ignored. Additionally, `YARN`s to be cast to `NUMBR`
may lead with `"0"` or `"0x"` to indicate that the string should be
interpreted as an octal or hexadecimal value, respectively.

This change required the modification of several tests which previously
checked that casting an empty or completely non-numeric `YARN` resulted
in an error. These now verify that such a conversion results in a zero
of the appropriate type.
---
 interpreter.c                                 | 72 ++-----------------
 interpreter.h                                 |  1 -
 .../5-FromString/2-EmptyString/CMakeLists.txt |  2 +-
 .../5-FromString/2-EmptyString/test.err       |  0
 .../5-FromString/2-EmptyString/test.lol       |  2 +-
 .../5-FromString/2-EmptyString/test.out       |  1 +
 .../5-FromString/2-EmptyString/test.readme    |  2 +-
 .../5-FromString/3-NonNumber/CMakeLists.txt   |  2 +-
 .../5-FromString/3-NonNumber/test.err         |  0
 .../5-FromString/3-NonNumber/test.lol         |  2 +-
 .../5-FromString/3-NonNumber/test.out         |  1 +
 .../5-FromString/3-NonNumber/test.readme      |  2 +-
 .../4-RelaxedNumbers/CMakeLists.txt           |  2 +
 .../5-FromString/4-RelaxedNumbers/test.lol    |  6 ++
 .../5-FromString/4-RelaxedNumbers/test.out    |  4 ++
 .../5-FromString/4-RelaxedNumbers/test.readme |  2 +
 .../3-ToInteger/5-FromString/CMakeLists.txt   |  1 +
 .../5-FromString/2-EmptyString/CMakeLists.txt |  2 +-
 .../5-FromString/2-EmptyString/test.err       |  0
 .../5-FromString/2-EmptyString/test.lol       |  2 +-
 .../5-FromString/2-EmptyString/test.out       |  1 +
 .../5-FromString/2-EmptyString/test.readme    |  2 +-
 .../5-FromString/3-NonNumber/CMakeLists.txt   |  2 +-
 .../5-FromString/3-NonNumber/test.err         |  0
 .../5-FromString/3-NonNumber/test.lol         |  2 +-
 .../5-FromString/3-NonNumber/test.out         |  1 +
 .../5-FromString/3-NonNumber/test.readme      |  2 +-
 .../4-RelaxedNumbers/CMakeLists.txt           |  2 +
 .../5-FromString/4-RelaxedNumbers/test.lol    |  4 ++
 .../5-FromString/4-RelaxedNumbers/test.out    |  2 +
 .../5-FromString/4-RelaxedNumbers/test.readme |  2 +
 .../4-ToFloat/5-FromString/CMakeLists.txt     |  1 +
 .../5-FromString/2-EmptyString/CMakeLists.txt |  2 +-
 .../5-FromString/2-EmptyString/test.err       |  0
 .../5-FromString/2-EmptyString/test.lol       |  1 +
 .../5-FromString/2-EmptyString/test.out       |  1 +
 .../5-FromString/2-EmptyString/test.readme    |  2 +-
 .../5-FromString/3-NonNumber/CMakeLists.txt   |  2 +-
 .../5-FromString/3-NonNumber/test.err         |  0
 .../5-FromString/3-NonNumber/test.lol         |  1 +
 .../5-FromString/3-NonNumber/test.out         |  1 +
 .../5-FromString/3-NonNumber/test.readme      |  2 +-
 .../4-RelaxedNumbers/CMakeLists.txt           |  2 +
 .../5-FromString/4-RelaxedNumbers/test.lol    | 14 ++++
 .../5-FromString/4-RelaxedNumbers/test.out    |  4 ++
 .../5-FromString/4-RelaxedNumbers/test.readme |  2 +
 .../3-ToInteger/5-FromString/CMakeLists.txt   |  1 +
 .../5-FromString/2-EmptyString/CMakeLists.txt |  2 +-
 .../5-FromString/2-EmptyString/test.err       |  0
 .../5-FromString/2-EmptyString/test.lol       |  1 +
 .../5-FromString/2-EmptyString/test.out       |  1 +
 .../5-FromString/2-EmptyString/test.readme    |  2 +-
 .../5-FromString/3-NonNumber/CMakeLists.txt   |  2 +-
 .../5-FromString/3-NonNumber/test.err         |  0
 .../5-FromString/3-NonNumber/test.lol         |  1 +
 .../5-FromString/3-NonNumber/test.out         |  1 +
 .../5-FromString/3-NonNumber/test.readme      |  2 +-
 .../4-RelaxedNumbers/CMakeLists.txt           |  2 +
 .../5-FromString/4-RelaxedNumbers/test.lol    |  8 +++
 .../5-FromString/4-RelaxedNumbers/test.out    |  2 +
 .../5-FromString/4-RelaxedNumbers/test.readme |  3 +
 .../4-ToFloat/5-FromString/CMakeLists.txt     |  1 +
 62 files changed, 101 insertions(+), 89 deletions(-)
 delete mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.err
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.out
 delete mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.err
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.out
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/CMakeLists.txt
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.lol
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.out
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.readme
 delete mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.err
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.out
 delete mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.err
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.out
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/CMakeLists.txt
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.lol
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.out
 create mode 100644 test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.readme
 delete mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.err
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.out
 delete mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.err
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.out
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/CMakeLists.txt
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.lol
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.out
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.readme
 delete mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.err
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.out
 delete mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.err
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.out
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/CMakeLists.txt
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.lol
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.out
 create mode 100644 test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.readme

diff --git a/interpreter.c b/interpreter.c
index f90698d..2f03ae4 100644
--- a/interpreter.c
+++ b/interpreter.c
@@ -20,34 +20,6 @@ char *copyString(char *data)
 	return p;
 }
 
-/**
- * Checks if a string follows the format of a decimal number.
- *
- * \param [in] data The string to check the format of.
- *
- * \retval 0 The string is not a decimal number.
- *
- * \retval 1 The string is a decimal number.
- */
-unsigned int isDecString(const char *data)
-{
-	size_t n;
-	size_t len = strlen(data);
-
-	/* Check for an empty string */
-	if (len == 0) return 0;
-
-	/* Check for non-digit, non-hyphen, and non-period characters */
-	for (n = 0; n < len; n++) {
-		if (!isdigit(data[n])
-				&& data[n] != '.'
-				&& data[n] != '-')
-			return 0;
-	}
-
-	return 1;
-}
-
 /**
  * Checks if a string follows the format of a hexadecimal number.
  *
@@ -1338,32 +1310,14 @@ ValueObject *castIntegerExplicit(ValueObject *node,
 				/* Perform interpolation */
 				ValueObject *ret = NULL;
 				ValueObject *interp = castStringExplicit(node, scope);
-				long long value;
 				if (!interp) return NULL;
-				if (!isDecString(getString(interp))) {
-					error(IN_UNABLE_TO_CAST_VALUE);
-					deleteValueObject(interp);
-					return NULL;
-				}
-				if (sscanf(getString(interp), "%lli", &value) != 1) {
-					error(IN_EXPECTED_INTEGER_VALUE);
-					deleteValueObject(interp);
-					return NULL;
-				}
+				long long value = strtoll(getString(interp), NULL, 0);
 				ret = createIntegerValueObject(value);
 				deleteValueObject(interp);
 				return ret;
 			}
 			else {
-				long long value;
-				if (!isDecString(getString(node))) {
-					error(IN_UNABLE_TO_CAST_VALUE);
-					return NULL;
-				}
-				if (sscanf(getString(node), "%lli", &value) != 1) {
-					error(IN_EXPECTED_INTEGER_VALUE);
-					return NULL;
-				}
+				long long value = strtoll(getString(node), NULL, 0);
 				return createIntegerValueObject(value);
 			}
 		case VT_FUNC:
@@ -1409,32 +1363,14 @@ ValueObject *castFloatExplicit(ValueObject *node,
 				/* Perform interpolation */
 				ValueObject *ret = NULL;
 				ValueObject *interp = castStringExplicit(node, scope);
-				float value;
 				if (!interp) return NULL;
-				if (!isDecString(getString(interp))) {
-					error(IN_UNABLE_TO_CAST_VALUE);
-					deleteValueObject(interp);
-					return NULL;
-				}
-				if (sscanf(getString(interp), "%f", &value) != 1) {
-					error(IN_EXPECTED_DECIMAL);
-					deleteValueObject(interp);
-					return NULL;
-				}
+				float value = strtof(getString(interp), NULL);
 				ret = createFloatValueObject(value);
 				deleteValueObject(interp);
 				return ret;
 			}
 			else {
-				float value;
-				if (!isDecString(getString(node))) {
-					error(IN_UNABLE_TO_CAST_VALUE);
-					return NULL;
-				}
-				if (sscanf(getString(node), "%f", &value) != 1) {
-					error(IN_EXPECTED_DECIMAL);
-					return NULL;
-				}
+				float value = strtof(getString(node), NULL);
 				return createFloatValueObject(value);
 			}
 		case VT_FUNC:
diff --git a/interpreter.h b/interpreter.h
index 7dbd9d6..7b78b81 100644
--- a/interpreter.h
+++ b/interpreter.h
@@ -133,7 +133,6 @@ typedef struct scopeobject {
 /**@{*/
 void printInterpreterError(const char *, IdentifierNode *, ScopeObject *);
 char *copyString(char *);
-unsigned int isDecString(const char *);
 unsigned int isHexString(const char *);
 char *resolveIdentifierName(IdentifierNode *, ScopeObject *);
 int resolveTerminalSlot(ScopeObject *, ScopeObject *, IdentifierNode *, ScopeObject **, IdentifierNode **);
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/CMakeLists.txt b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/CMakeLists.txt
index 754994b..093aff6 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/CMakeLists.txt
@@ -1,2 +1,2 @@
 INCLUDE(AddLolTest)
-ADD_LOL_TEST(2-EmptyString ERROR)
+ADD_LOL_TEST(2-EmptyString OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.err b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.err
deleted file mode 100644
index e69de29..0000000
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.lol b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.lol
index f6c21a6..f47d7d8 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.lol
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.lol
@@ -1,3 +1,3 @@
 HAI 1.3
-	MAEK "" A NUMBR
+	VISIBLE MAEK "" A NUMBR
 KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.out b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.out
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.out
@@ -0,0 +1 @@
+0
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.readme b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.readme
index 621ab9a..c1d4aa7 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.readme
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/2-EmptyString/test.readme
@@ -1,2 +1,2 @@
 This test checks to make sure explicitly casting an empty string to an integer
-type results in an error.
+type results in 0.
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/CMakeLists.txt b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/CMakeLists.txt
index 76c3f19..d14ceab 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/CMakeLists.txt
@@ -1,2 +1,2 @@
 INCLUDE(AddLolTest)
-ADD_LOL_TEST(3-NonNumber ERROR)
+ADD_LOL_TEST(3-NonNumber OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.err b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.err
deleted file mode 100644
index e69de29..0000000
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.lol b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.lol
index ff0b1c4..b1f22b9 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.lol
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.lol
@@ -1,3 +1,3 @@
 HAI 1.3
-	MAEK "abc" A NUMBR
+	VISIBLE MAEK "abc" A NUMBR
 KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.out b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.out
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.out
@@ -0,0 +1 @@
+0
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.readme b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.readme
index 2e9553b..1364d4e 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.readme
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/3-NonNumber/test.readme
@@ -1,2 +1,2 @@
 This test checks to make sure explicitly casting a non-number string to an
-integer type results in an error.
+integer type results in 0.
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/CMakeLists.txt b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/CMakeLists.txt
new file mode 100644
index 0000000..9bb607c
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/CMakeLists.txt
@@ -0,0 +1,2 @@
+INCLUDE(AddLolTest)
+ADD_LOL_TEST(4-RelaxedNumbers OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.lol b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.lol
new file mode 100644
index 0000000..cc11f72
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.lol
@@ -0,0 +1,6 @@
+HAI 1.3
+	VISIBLE MAEK " 123" A NUMBR BTW leading whitespace is ignored
+	VISIBLE MAEK "123x" A NUMBR BTW parsing stops at the first non-digit
+	VISIBLE MAEK "0377" A NUMBR BTW octal prefix
+	VISIBLE MAEK "0xFF" A NUMBR BTW hexadecimal prefix
+KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.out b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.out
new file mode 100644
index 0000000..93374fc
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.out
@@ -0,0 +1,4 @@
+123
+123
+255
+255
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.readme b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.readme
new file mode 100644
index 0000000..485f16d
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.readme
@@ -0,0 +1,2 @@
+This test checks that the explicit cast operator correctly casts string values
+to integer types as would be done by libc's strtoll() function.
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/CMakeLists.txt b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/CMakeLists.txt
index d8ddc15..63389f9 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/3-ToInteger/5-FromString/CMakeLists.txt
@@ -1,3 +1,4 @@
 add_subdirectory(1-Numbers)
 add_subdirectory(2-EmptyString)
 add_subdirectory(3-NonNumber)
+add_subdirectory(4-RelaxedNumbers)
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/CMakeLists.txt b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/CMakeLists.txt
index 754994b..093aff6 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/CMakeLists.txt
@@ -1,2 +1,2 @@
 INCLUDE(AddLolTest)
-ADD_LOL_TEST(2-EmptyString ERROR)
+ADD_LOL_TEST(2-EmptyString OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.err b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.err
deleted file mode 100644
index e69de29..0000000
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.lol b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.lol
index 3a7e9a5..0b028a8 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.lol
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.lol
@@ -1,3 +1,3 @@
 HAI 1.3
-	MAEK "" A NUMBAR
+	VISIBLE MAEK "" A NUMBAR
 KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.out b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.out
new file mode 100644
index 0000000..fb1088c
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.out
@@ -0,0 +1 @@
+0.00
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.readme b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.readme
index cf463bc..be2002f 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.readme
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/2-EmptyString/test.readme
@@ -1,2 +1,2 @@
 This test checks to make sure explicitly casting an empty string to a floating
-point decimal type results in an error.
+point decimal type results in 0.00.
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/CMakeLists.txt b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/CMakeLists.txt
index 76c3f19..d14ceab 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/CMakeLists.txt
@@ -1,2 +1,2 @@
 INCLUDE(AddLolTest)
-ADD_LOL_TEST(3-NonNumber ERROR)
+ADD_LOL_TEST(3-NonNumber OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.err b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.err
deleted file mode 100644
index e69de29..0000000
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.lol b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.lol
index 1adbf1e..783ea36 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.lol
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.lol
@@ -1,3 +1,3 @@
 HAI 1.3
-	MAEK "abc" A NUMBAR
+	VISIBLE MAEK "abc" A NUMBAR
 KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.out b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.out
new file mode 100644
index 0000000..fb1088c
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.out
@@ -0,0 +1 @@
+0.00
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.readme b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.readme
index 3af145a..15345c7 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.readme
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/3-NonNumber/test.readme
@@ -1,2 +1,2 @@
 This test checks to make sure explicitly casting a non-number string to a
-floating point decimal type results in an error.
+floating point decimal type results in 0.00.
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/CMakeLists.txt b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/CMakeLists.txt
new file mode 100644
index 0000000..9bb607c
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/CMakeLists.txt
@@ -0,0 +1,2 @@
+INCLUDE(AddLolTest)
+ADD_LOL_TEST(4-RelaxedNumbers OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.lol b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.lol
new file mode 100644
index 0000000..67f77cd
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.lol
@@ -0,0 +1,4 @@
+HAI 1.3
+	VISIBLE MAEK " 1.23" A NUMBAR BTW leading whitespace is ignored
+	VISIBLE MAEK "1.23x" A NUMBAR BTW parsing stops at the first non-digit
+KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.out b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.out
new file mode 100644
index 0000000..f549c6b
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.out
@@ -0,0 +1,2 @@
+1.23
+1.23
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.readme b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.readme
new file mode 100644
index 0000000..f02cbf0
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.readme
@@ -0,0 +1,2 @@
+This test checks that the explicit cast operator correctly casts string values
+to floating point decimal types as would be done by libc's strtof() function.
diff --git a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/CMakeLists.txt b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/CMakeLists.txt
index d8ddc15..63389f9 100644
--- a/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/17-ExplicitCast/4-ToFloat/5-FromString/CMakeLists.txt
@@ -1,3 +1,4 @@
 add_subdirectory(1-Numbers)
 add_subdirectory(2-EmptyString)
 add_subdirectory(3-NonNumber)
+add_subdirectory(4-RelaxedNumbers)
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/CMakeLists.txt b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/CMakeLists.txt
index 754994b..093aff6 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/CMakeLists.txt
@@ -1,2 +1,2 @@
 INCLUDE(AddLolTest)
-ADD_LOL_TEST(2-EmptyString ERROR)
+ADD_LOL_TEST(2-EmptyString OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.err b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.err
deleted file mode 100644
index e69de29..0000000
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.lol b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.lol
index a254871..79a54a4 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.lol
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.lol
@@ -1,4 +1,5 @@
 HAI 1.3
 	I HAS A var ITZ ""
 	var IS NOW A NUMBR
+	VISIBLE var
 KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.out b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.out
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.out
@@ -0,0 +1 @@
+0
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.readme b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.readme
index 1ff03c9..bf0da71 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.readme
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/2-EmptyString/test.readme
@@ -1,2 +1,2 @@
 This test checks to make sure explicitly recasting an empty string to an
-integer type results in an error.
+integer type results in 0.
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/CMakeLists.txt b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/CMakeLists.txt
index 76c3f19..d14ceab 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/CMakeLists.txt
@@ -1,2 +1,2 @@
 INCLUDE(AddLolTest)
-ADD_LOL_TEST(3-NonNumber ERROR)
+ADD_LOL_TEST(3-NonNumber OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.err b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.err
deleted file mode 100644
index e69de29..0000000
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.lol b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.lol
index 2c6d603..3c7cf75 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.lol
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.lol
@@ -1,4 +1,5 @@
 HAI 1.3
 	I HAS A var ITZ "abc"
 	var IS NOW A NUMBR
+	VISIBLE var
 KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.out b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.out
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.out
@@ -0,0 +1 @@
+0
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.readme b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.readme
index 7fcf480..3ca976f 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.readme
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/3-NonNumber/test.readme
@@ -1,2 +1,2 @@
 This test checks to make sure explicitly recasting a non-number string to an
-integer type results in an error.
+integer type results in 0.
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/CMakeLists.txt b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/CMakeLists.txt
new file mode 100644
index 0000000..9bb607c
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/CMakeLists.txt
@@ -0,0 +1,2 @@
+INCLUDE(AddLolTest)
+ADD_LOL_TEST(4-RelaxedNumbers OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.lol b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.lol
new file mode 100644
index 0000000..2ba13f5
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.lol
@@ -0,0 +1,14 @@
+HAI 1.3
+	I HAS A var1 ITZ " 123" BTW leading whitespace is ignored
+	I HAS A var2 ITZ "123x" BTW parsing stops at the first non-digit
+	I HAS A var3 ITZ "0377" BTW octal prefix
+	I HAS A var4 ITZ "0xFF" BTW hexadecimal prefix
+	var1 IS NOW A NUMBR
+	var2 IS NOW A NUMBR
+	var3 IS NOW A NUMBR
+	var4 IS NOW A NUMBR
+	VISIBLE var1
+	VISIBLE var2
+	VISIBLE var3
+	VISIBLE var4
+KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.out b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.out
new file mode 100644
index 0000000..93374fc
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.out
@@ -0,0 +1,4 @@
+123
+123
+255
+255
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.readme b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.readme
new file mode 100644
index 0000000..0468c3a
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/4-RelaxedNumbers/test.readme
@@ -0,0 +1,2 @@
+This test checks that the explicit recast operator correctly casts string
+values to integer types as would be done by libc's strtoll() function.
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/CMakeLists.txt b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/CMakeLists.txt
index d8ddc15..63389f9 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/3-ToInteger/5-FromString/CMakeLists.txt
@@ -1,3 +1,4 @@
 add_subdirectory(1-Numbers)
 add_subdirectory(2-EmptyString)
 add_subdirectory(3-NonNumber)
+add_subdirectory(4-RelaxedNumbers)
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/CMakeLists.txt b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/CMakeLists.txt
index 754994b..093aff6 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/CMakeLists.txt
@@ -1,2 +1,2 @@
 INCLUDE(AddLolTest)
-ADD_LOL_TEST(2-EmptyString ERROR)
+ADD_LOL_TEST(2-EmptyString OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.err b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.err
deleted file mode 100644
index e69de29..0000000
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.lol b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.lol
index bb453b3..723534b 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.lol
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.lol
@@ -1,4 +1,5 @@
 HAI 1.3
 	I HAS A var ITZ ""
 	var IS NOW A NUMBAR
+	VISIBLE var
 KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.out b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.out
new file mode 100644
index 0000000..fb1088c
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.out
@@ -0,0 +1 @@
+0.00
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.readme b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.readme
index 02f9b6d..639ebee 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.readme
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/2-EmptyString/test.readme
@@ -1,2 +1,2 @@
 This test checks to make sure explicitly recasting an empty string to a
-floating point decimal type results in an error.
+floating point decimal type results in 0.00.
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/CMakeLists.txt b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/CMakeLists.txt
index 76c3f19..d14ceab 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/CMakeLists.txt
@@ -1,2 +1,2 @@
 INCLUDE(AddLolTest)
-ADD_LOL_TEST(3-NonNumber ERROR)
+ADD_LOL_TEST(3-NonNumber OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.err b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.err
deleted file mode 100644
index e69de29..0000000
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.lol b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.lol
index 9131aa5..69b2567 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.lol
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.lol
@@ -1,4 +1,5 @@
 HAI 1.3
 	I HAS A var ITZ "abc"
 	var IS NOW A NUMBAR
+	VISIBLE var
 KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.out b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.out
new file mode 100644
index 0000000..fb1088c
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.out
@@ -0,0 +1 @@
+0.00
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.readme b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.readme
index 135d6fa..9e46a50 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.readme
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/3-NonNumber/test.readme
@@ -1,2 +1,2 @@
 This test checks to make sure explicitly recasting a non-number string to a
-floating point decimal type results in an error.
+floating point decimal type results in 0.00.
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/CMakeLists.txt b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/CMakeLists.txt
new file mode 100644
index 0000000..9bb607c
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/CMakeLists.txt
@@ -0,0 +1,2 @@
+INCLUDE(AddLolTest)
+ADD_LOL_TEST(4-RelaxedNumbers OUTPUT test.out)
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.lol b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.lol
new file mode 100644
index 0000000..5cd3246
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.lol
@@ -0,0 +1,8 @@
+HAI 1.3
+	I HAS A var1 ITZ " 1.23" BTW leading whitespace is ignored
+	I HAS A var2 ITZ "1.23x" BTW parsing stops at the first non-digit
+	var1 IS NOW A NUMBAR
+	var2 IS NOW A NUMBAR
+	VISIBLE var1
+	VISIBLE var2
+KTHXBYE
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.out b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.out
new file mode 100644
index 0000000..f549c6b
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.out
@@ -0,0 +1,2 @@
+1.23
+1.23
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.readme b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.readme
new file mode 100644
index 0000000..b8fcb43
--- /dev/null
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/4-RelaxedNumbers/test.readme
@@ -0,0 +1,3 @@
+This test checks that the explicit recast operator correctly casts string
+values to floating point decimal types as would be done by libc's
+strtof() function.
diff --git a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/CMakeLists.txt b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/CMakeLists.txt
index d8ddc15..63389f9 100644
--- a/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/CMakeLists.txt
+++ b/test/1.3-Tests/7-Operators/18-ExplicitRecast/4-ToFloat/5-FromString/CMakeLists.txt
@@ -1,3 +1,4 @@
 add_subdirectory(1-Numbers)
 add_subdirectory(2-EmptyString)
 add_subdirectory(3-NonNumber)
+add_subdirectory(4-RelaxedNumbers)