- Support `(a/b) % m` when m is an integer and `gcd(b, m) != 1`.
- Support `(a/b) % m` when m is an integer and `gcd(b, m) != 1`.

This was changed in: 180ac0710ae6f71bd16996a4a32f361021daa414

We now fallback to the old behavior when `invmod(b,m)` does not exist.

Example:

	say (43/2 % 10)		#=> 1.5

Which is equivalent with:

	43/2 - 10*floor((43/2)/10)

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