Function cannot_overflow

pub fn cannot_overflow<T: Integer>(length: usize, radix: u32) -> bool

Check to see if parsing the float cannot possible overflow.

This allows major optimizations for those types, since we can skip checked arithmetic.

Adapted from the rust corelib.

core: https://doc.rust-lang.org/1.81.0/src/core/num/mod.rs.html#1389