Actually, I would agree that decimal values should have an $ord of 'th'. Ordinals convert a number's meaning to make it relative to some other number, so just its availability seems necessary for decimal values... even if you don't see it in common use.
However, I like how $ord treats the last character as it does, allowing $ord(1/3) to return 1/3rd. Just wish there was some accepted way to represent 'one half' like 1/2lf.
- Raccoon