Merge branch 'num_methods' of git://github.com/MarcoLizza/wren into MarcoLizza-num_methods

test/number/fraction.wren

@@ -0,0 +1,19 @@
+IO.print(123.fraction)      // expect: 0
+IO.print((-123).fraction)   // expect: -0
+IO.print(0.fraction)        // expect: 0
+IO.print((-0).fraction)     // expect: -0
+IO.print(0.123.fraction)    // expect: 0.123
+IO.print(12.3.fraction)     // expect: 0.3
+IO.print((-0.123).fraction) // expect: -0.123
+IO.print((-12.3).fraction)  // expect: -0.3
+
+// Using 32-bit representation, a longer mantissa will lead to
+// approximation.
+IO.print((1.23456789012345).fraction)  // expect: 0.23456789012345
+IO.print((-1.23456789012345).fraction)  // expect: -0.23456789012345
+
+IO.print((0.000000000000000000000000000000000000000001).fraction)  // expect: 1e-42
+IO.print((-0.000000000000000000000000000000000000000001).fraction)  // expect: -1e-42
+
+IO.print((1.000000000000000000000000000000000000000001).fraction)  // expect: 0
+IO.print((-1.000000000000000000000000000000000000000001).fraction)  // expect: -0

test/number/sign.wren

@@ -0,0 +1,6 @@
+IO.print(123.sign)      // expect: 1
+IO.print((-123).sign)   // expect: -1
+IO.print(0.sign)        // expect: 0
+IO.print((-0).sign)     // expect: 0
+IO.print(0.123.sign)    // expect: 1
+IO.print((-0.123).sign) // expect: -1

test/number/truncate.wren

@@ -0,0 +1,13 @@
+IO.print(123.truncate)      // expect: 123
+IO.print((-123).truncate)   // expect: -123
+IO.print(0.truncate)        // expect: 0
+IO.print((-0).truncate)     // expect: -0
+IO.print(0.123.truncate)    // expect: 0
+IO.print(12.3.truncate)     // expect: 12
+IO.print((-0.123).truncate) // expect: -0
+IO.print((-12.3).truncate)  // expect: -12
+
+// Using 32-bit representation, values "beyond" those  two will lead to
+// approximation.
+IO.print((12345678901234.5).truncate)   // expect: 12345678901234
+IO.print((-12345678901234.5).truncate)  // expect: -12345678901234