Ranges: interpretations are displayed incorrectly

In hex mode:

- every `i8` and `u8` should be just one byte (i.e. `0xXX`)
- every `i16` and `u16` should be exactly two bytes (i.e. `0xXXXX`)
- every `x24` should be 3 bytes
- every `x32` should be 4 bytes
- every `x64` should be 8 bytes

In dec mode:

- rendering `000` makes no sense. It's just `0`.
- negative values should be just negative values, `0-1` is incorrect.