diff --git a/repl/lib_standard.c b/repl/lib_standard.c
index 7db588b..1c333db 100644
--- a/repl/lib_standard.c
+++ b/repl/lib_standard.c
@@ -47,11 +47,6 @@ static int nativeHash(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments)
 		Toy_freeLiteral(selfLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		return -1;
-	}
-
 	Toy_Literal result = TOY_TO_INTEGER_LITERAL(Toy_hashLiteral(selfLiteral));
 
 	Toy_pushLiteralArray(&interpreter->stack, result);
@@ -77,11 +72,6 @@ static int nativeAbs(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments)
 		Toy_freeLiteral(selfLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		return -1;
-	}
-
 	if (!(TOY_IS_INTEGER(selfLiteral) || TOY_IS_FLOAT(selfLiteral))) {
 		interpreter->errorOutput("Incorrect argument type passed to abs\n");
 		Toy_freeLiteral(selfLiteral);
@@ -120,11 +110,6 @@ static int nativeCeil(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments)
 		Toy_freeLiteral(selfLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		return -1;
-	}
-
 	if (!(TOY_IS_INTEGER(selfLiteral) || TOY_IS_FLOAT(selfLiteral))) {
 		interpreter->errorOutput("Incorrect argument type passed to ceil\n");
 		Toy_freeLiteral(selfLiteral);
@@ -164,11 +149,6 @@ static int nativeFloor(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments
 		Toy_freeLiteral(selfLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		return -1;
-	}
-
 	if (!(TOY_IS_INTEGER(selfLiteral) || TOY_IS_FLOAT(selfLiteral))) {
 		interpreter->errorOutput("Incorrect argument type passed to floor\n");
 		Toy_freeLiteral(selfLiteral);
@@ -208,11 +188,6 @@ static int nativeMax(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments)
 			Toy_freeLiteral(selfLiteralIdn);
 		}
 
-		if (TOY_IS_IDENTIFIER(selfLiteral)) {
-			Toy_freeLiteral(selfLiteral);
-			return -1;
-		}
-
 		if (!(TOY_IS_INTEGER(selfLiteral) || TOY_IS_FLOAT(selfLiteral))) {
 			interpreter->errorOutput("Incorrect argument type passed to max\n");
 			Toy_freeLiteral(selfLiteral);
@@ -269,11 +244,6 @@ static int nativeMin(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments)
 			Toy_freeLiteral(selfLiteralIdn);
 		}
 
-		if (TOY_IS_IDENTIFIER(selfLiteral)) {
-			Toy_freeLiteral(selfLiteral);
-			return -1;
-		}
-
 		if (!(TOY_IS_INTEGER(selfLiteral) || TOY_IS_FLOAT(selfLiteral))) {
 			interpreter->errorOutput("Incorrect argument type passed to min\n");
 			Toy_freeLiteral(selfLiteral);
@@ -330,11 +300,6 @@ static int nativeRound(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments
 		Toy_freeLiteral(selfLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		return -1;
-	}
-
 	if (!(TOY_IS_INTEGER(selfLiteral) || TOY_IS_FLOAT(selfLiteral))) {
 		interpreter->errorOutput("Incorrect argument type passed to round\n");
 		Toy_freeLiteral(selfLiteral);
@@ -365,6 +330,109 @@ static int nativeRound(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments
 	return 1;
 }
 
+static int nativeSign(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments) {
+	if (arguments->count != 1) {
+		interpreter->errorOutput("Incorrect number of arguments to sign\n");
+		return -1;
+	}
+
+	//get the self
+	Toy_Literal selfLiteral = Toy_popLiteralArray(arguments);
+
+	//parse to value if needed
+	Toy_Literal selfLiteralIdn = selfLiteral;
+	if (TOY_IS_IDENTIFIER(selfLiteral) && Toy_parseIdentifierToValue(interpreter, &selfLiteral)) {
+		Toy_freeLiteral(selfLiteralIdn);
+	}
+
+	if (!(TOY_IS_INTEGER(selfLiteral) || TOY_IS_FLOAT(selfLiteral))) {
+		interpreter->errorOutput("Incorrect argument type passed to sign\n");
+		Toy_freeLiteral(selfLiteral);
+		return -1;
+	}
+
+	Toy_Literal resultLiteral = TOY_TO_NULL_LITERAL;
+
+	if (TOY_IS_INTEGER(selfLiteral)) {
+		if (TOY_AS_INTEGER(selfLiteral) < 0) {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(-1);
+		}
+		else {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(1);
+		}
+	}
+	if (TOY_IS_FLOAT(selfLiteral)) {
+		if (TOY_AS_FLOAT(selfLiteral) < 0) {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(-1);
+		}
+		else {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(1);
+		}
+	}
+
+	Toy_pushLiteralArray(&interpreter->stack, resultLiteral);
+
+	Toy_freeLiteral(resultLiteral);
+	Toy_freeLiteral(selfLiteral);
+
+	return 1;
+}
+
+static int nativeNormalize(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments) {
+	//NOTE: this is identical to `sign`, except it returns 0 when the argument is 0.
+	if (arguments->count != 1) {
+		interpreter->errorOutput("Incorrect number of arguments to normalize\n");
+		return -1;
+	}
+
+	//get the self
+	Toy_Literal selfLiteral = Toy_popLiteralArray(arguments);
+
+	//parse to value if needed
+	Toy_Literal selfLiteralIdn = selfLiteral;
+	if (TOY_IS_IDENTIFIER(selfLiteral) && Toy_parseIdentifierToValue(interpreter, &selfLiteral)) {
+		Toy_freeLiteral(selfLiteralIdn);
+	}
+
+	if (!(TOY_IS_INTEGER(selfLiteral) || TOY_IS_FLOAT(selfLiteral))) {
+		interpreter->errorOutput("Incorrect argument type passed to normalize\n");
+		Toy_freeLiteral(selfLiteral);
+		return -1;
+	}
+
+	Toy_Literal resultLiteral = TOY_TO_NULL_LITERAL;
+
+	if (TOY_IS_INTEGER(selfLiteral)) {
+		if (TOY_AS_INTEGER(selfLiteral) < 0) {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(-1);
+		}
+		else if (TOY_AS_INTEGER(selfLiteral) > 0) {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(1);
+		}
+		else {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(0);
+		}
+	}
+	if (TOY_IS_FLOAT(selfLiteral)) {
+		if (TOY_AS_FLOAT(selfLiteral) < 0) {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(-1);
+		}
+		else if (TOY_AS_FLOAT(selfLiteral) > 0) {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(1);
+		}
+		else {
+			resultLiteral = TOY_TO_INTEGER_LITERAL(0);
+		}
+	}
+
+	Toy_pushLiteralArray(&interpreter->stack, resultLiteral);
+
+	Toy_freeLiteral(resultLiteral);
+	Toy_freeLiteral(selfLiteral);
+
+	return 1;
+}
+
 static int nativeClamp(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments) {
 	if (arguments->count != 3) {
 		interpreter->errorOutput("Incorrect number of arguments to clamp\n");
@@ -526,12 +594,6 @@ static int nativeConcat(Toy_Interpreter* interpreter, Toy_LiteralArray* argument
 		Toy_freeLiteral(otherLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(otherLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(otherLiteral);
-		return -1;
-	}
-
 	//for each self type
 	if (TOY_IS_ARRAY(selfLiteral)) {
 		if (!TOY_IS_ARRAY(otherLiteral)) {
@@ -642,12 +704,6 @@ static int nativeContainsKey(Toy_Interpreter* interpreter, Toy_LiteralArray* arg
 		Toy_freeLiteral(keyLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(keyLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(keyLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!(/* TOY_IS_ARRAY(selfLiteral) || */ TOY_IS_DICTIONARY(selfLiteral) )) {
 		interpreter->errorOutput("Incorrect argument type passed to containsKey\n");
@@ -693,12 +749,6 @@ static int nativeContainsValue(Toy_Interpreter* interpreter, Toy_LiteralArray* a
 		Toy_freeLiteral(valueLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(valueLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(valueLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!( TOY_IS_ARRAY(selfLiteral) || TOY_IS_DICTIONARY(selfLiteral) )) {
 		interpreter->errorOutput("Incorrect argument type passed to containsValue\n");
@@ -769,12 +819,6 @@ static int nativeEvery(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments
 		Toy_freeLiteral(fnLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(fnLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(fnLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!( TOY_IS_ARRAY(selfLiteral) || TOY_IS_DICTIONARY(selfLiteral) ) || !( TOY_IS_FUNCTION(fnLiteral) || TOY_IS_FUNCTION_NATIVE(fnLiteral) )) {
 		interpreter->errorOutput("Incorrect argument type passed to every\n");
@@ -891,12 +935,6 @@ static int nativeFilter(Toy_Interpreter* interpreter, Toy_LiteralArray* argument
 		Toy_freeLiteral(fnLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(fnLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(fnLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!( TOY_IS_ARRAY(selfLiteral) || TOY_IS_DICTIONARY(selfLiteral) ) || !( TOY_IS_FUNCTION(fnLiteral) || TOY_IS_FUNCTION_NATIVE(fnLiteral) )) {
 		interpreter->errorOutput("Incorrect argument type passed to filter\n");
@@ -1011,12 +1049,6 @@ static int nativeForEach(Toy_Interpreter* interpreter, Toy_LiteralArray* argumen
 		Toy_freeLiteral(fnLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(fnLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(fnLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!( TOY_IS_ARRAY(selfLiteral) || TOY_IS_DICTIONARY(selfLiteral) ) || !( TOY_IS_FUNCTION(fnLiteral) || TOY_IS_FUNCTION_NATIVE(fnLiteral) )) {
 		interpreter->errorOutput("Incorrect argument type passed to forEach\n");
@@ -1089,11 +1121,6 @@ static int nativeGetKeys(Toy_Interpreter* interpreter, Toy_LiteralArray* argumen
 		Toy_freeLiteral(selfLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!TOY_IS_DICTIONARY(selfLiteral)) {
 		interpreter->errorOutput("Incorrect argument type passed to getKeys\n");
@@ -1139,11 +1166,6 @@ static int nativeGetValues(Toy_Interpreter* interpreter, Toy_LiteralArray* argum
 		Toy_freeLiteral(selfLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!TOY_IS_DICTIONARY(selfLiteral)) {
 		interpreter->errorOutput("Incorrect argument type passed to getValues\n");
@@ -1196,12 +1218,6 @@ static int nativeIndexOf(Toy_Interpreter* interpreter, Toy_LiteralArray* argumen
 		Toy_freeLiteral(valueLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(valueLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(valueLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!TOY_IS_ARRAY(selfLiteral)) {
 		interpreter->errorOutput("Incorrect argument type passed to indexOf\n");
@@ -1249,12 +1265,6 @@ static int nativeMap(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments)
 		Toy_freeLiteral(fnLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(fnLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(fnLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!( TOY_IS_ARRAY(selfLiteral) || TOY_IS_DICTIONARY(selfLiteral) ) || !( TOY_IS_FUNCTION(fnLiteral) || TOY_IS_FUNCTION_NATIVE(fnLiteral) )) {
 		interpreter->errorOutput("Incorrect argument type passed to map\n");
@@ -1364,13 +1374,6 @@ static int nativeReduce(Toy_Interpreter* interpreter, Toy_LiteralArray* argument
 		Toy_freeLiteral(fnLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(defaultLiteral) || TOY_IS_IDENTIFIER(fnLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(defaultLiteral);
-		Toy_freeLiteral(fnLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!( TOY_IS_ARRAY(selfLiteral) || TOY_IS_DICTIONARY(selfLiteral) ) || !( TOY_IS_FUNCTION(fnLiteral) || TOY_IS_FUNCTION_NATIVE(fnLiteral) )) {
 		interpreter->errorOutput("Incorrect argument type passed to reduce\n");
@@ -1466,12 +1469,6 @@ static int nativeSome(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments)
 		Toy_freeLiteral(fnLiteralIdn);
 	}
 
-	if (TOY_IS_IDENTIFIER(selfLiteral) || TOY_IS_IDENTIFIER(fnLiteral)) {
-		Toy_freeLiteral(selfLiteral);
-		Toy_freeLiteral(fnLiteral);
-		return -1;
-	}
-
 	//check type
 	if (!( TOY_IS_ARRAY(selfLiteral) || TOY_IS_DICTIONARY(selfLiteral) ) || !( TOY_IS_FUNCTION(fnLiteral) || TOY_IS_FUNCTION_NATIVE(fnLiteral) )) {
 		interpreter->errorOutput("Incorrect argument type passed to some\n");
@@ -2136,6 +2133,8 @@ int Toy_hookStandard(Toy_Interpreter* interpreter, Toy_Literal identifier, Toy_L
 		{"max", nativeMax},
 		{"min", nativeMin},
 		{"round", nativeRound},
+		{"sign", nativeSign},
+		{"normalize", nativeNormalize},
 		{"clamp", nativeClamp},
 		{"lerp", nativeLerp},