Move ComparisonNumber into the library and add an OwnedLiteral for booleans.

src/renderer/math.rs

@@ -18,6 +18,13 @@ impl From<&OwnedLiteral> for MathNumber {
     fn from(original: &OwnedLiteral) -> Self {
         match original {
             OwnedLiteral::LString(_) => panic!("Strings should not be cast to numbers for math"),
+            OwnedLiteral::LBoolean(boolean) => {
+                if *boolean {
+                    MathNumber::Integer(1)
+                } else {
+                    MathNumber::Integer(0)
+                }
+            }
             OwnedLiteral::LPositiveInteger(num) => {
                 return MathNumber::Integer((*num).try_into().unwrap())
             }