Changed return types of ceil, floor, round and (%) to return Int.

[jutaro]

Seems obvious to me.

[garyb]

This has been raised a few times, but there are a few problems doing this:

• (%) intentionally operates on Numbers, as it's the only way to get modulo behaviour for non-Ints. You can already do this with mod for Int.
• Using Int for the others restricts the acceptable values they can operate on to the range of Int32, significantly smaller than the range of integers that Number can safely represent.

[garyb]

Also 0.5 % 0.7 does not produce an Int, so the type isn't right for that either 😄

[paf31]

We should probably document those functions to explain the types :)

[paf31]

Maybe these belong in -integers?

[garyb]

Yeah, that would make sense.

[hdgarrood]

We have floor, ceil, and round with the types @jutaro wanted in integers now, so I think this can be closed.