feat: add ceil, cos, sin, sqrt, isNan native methods and division-by-zero tests

Implement five new Num methods (ceil, cos, sin, sqrt, isNan) in wren_core.c and register them on the Num class. Add corresponding test files for ceil, floor, is_nan, and sqrt. Extend divide.wren with division-by-zero edge cases (inf, -inf, nan). Remove stale TODO comments from minus, multiply, and plus tests.

test/number/ceil.wren

@@ -0,0 +1,8 @@
+IO.print(123.ceil)    // expect: 123
+IO.print(-123.ceil)   // expect: -123
+IO.print(0.ceil)      // expect: 0
+IO.print(-0.ceil)     // expect: -0
+IO.print(0.123.ceil)  // expect: 1
+IO.print(12.3.ceil)   // expect: 13
+IO.print(-0.123.ceil) // expect: -0
+IO.print(-12.3.ceil)  // expect: -12

test/number/divide.wren

@@ -1,5 +1,12 @@
-IO.print(8 / 2)        // expect: 4
-IO.print(12.34 / -0.4) // expect: -30.85
+IO.print(8 / 2)         // expect: 4
+IO.print(12.34 / -0.4)  // expect: -30.85
 
-// TODO: Unsupported RHS types.
-// TODO: Divide by zero.
+// Divide by zero.
+IO.print(3 / 0)         // expect: inf
+IO.print(-3 / 0)        // expect: -inf
+IO.print(0 / 0)         // expect: nan
+IO.print(-0 / 0)        // expect: nan
+IO.print(3 / -0)        // expect: -inf
+IO.print(-3 / -0)       // expect: inf
+IO.print(0 / -0)        // expect: nan
+IO.print(-0 / -0)       // expect: nan

test/number/floor.wren

@@ -0,0 +1,8 @@
+IO.print(123.floor)    // expect: 123
+IO.print(-123.floor)   // expect: -123
+IO.print(0.floor)      // expect: 0
+IO.print(-0.floor)     // expect: -0
+IO.print(0.123.floor)  // expect: 0
+IO.print(12.3.floor)   // expect: 12
+IO.print(-0.123.floor) // expect: -1
+IO.print(-12.3.floor)  // expect: -13

test/number/is_nan.wren

@@ -0,0 +1,5 @@
+IO.print(1.isNan)      // expect: false
+IO.print((0/0).isNan)  // expect: true
+
+// Infinity is not NaN.
+IO.print((1/0).isNan)  // expect: false

test/number/minus.wren

@@ -6,5 +6,3 @@ IO.print(3 - 2 - 1)  // expect: 0
 // Unary negation.
 var a = 3
 IO.print(-a) // expect: -3
-
-// TODO: Unsupported RHS types.

test/number/multiply.wren

@@ -1,4 +1,2 @@
 IO.print(5 * 3) // expect: 15
 IO.print(12.34 * 0.3) // expect: 3.702
-
-// TODO: Unsupported RHS types.

test/number/plus.wren

@@ -1,5 +1,3 @@
 IO.print(1 + 2) // expect: 3
 IO.print(12.34 + 0.13) // expect: 12.47
 IO.print(3 + 5 + 2) // expect: 10
-
-// TODO: Unsupported RHS types.

test/number/sqrt.wren

@@ -0,0 +1,10 @@
+IO.print(4.sqrt)        // expect: 2
+IO.print(1000000.sqrt)  // expect: 1000
+IO.print(1.sqrt)        // expect: 1
+IO.print(-0.sqrt)       // expect: -0
+IO.print(0.sqrt)        // expect: 0
+IO.print(2.sqrt)        // expect: 1.4142135623731
+
+IO.print(-4.sqrt.isNan) // expect: true
+
+// TODO: Tests for sin and cos.