Converts the given number to a signed 32-bit integer (`int32`) by rounding to the nearest whole number and typecasting.
If the number exceeds the range of an `int32` (-2,147,483,648 to 2,147,483,647), it will wrap due to typecasting.
s32(value)
s32(123456.7); // returns 123457
s32(-2200000000); // returns 194967296 (wraps)
s32(3000000000); // returns -1294967296 (wrap)