GDScript Modulo (%) with Floats: Warn user to use fmod() instead

[dotRelith]

Issue:

The modulo operator (%) in GDScript currently operates only on integers. When used with floating-point operands, it throws the given error: Invalid operands to operator %, float and float.

Proposed Solution:

To perform modulo operations on floating-point numbers in GDScript, the only way I know of is to use the fmod() function. I spent 30 minutes looking for a solution when I could've used fmod() instead. It would be helpful if the script language could warn the user about this limitation and suggest using fmod() function.

[Calinou]

• Pull request opened: Mention fmod() when relevant in GDScript error message about modulo types godot#93328

[Mickeon]

One time on RocketChat I asked why % does not work for floats in GDScript and the answer was... for legacy reasons, and that's mostly it, really. Adding support for it would be relatively simple, but I guess one may argue it is unexpected, as it does not work for most other programming languages.

[dalexeev]

Given the situation with the confusing division operator (integer vs real division), perhaps it's good for float modulo to have a global function instead of an operator. Although here confusion is less likely, unlike division.

[Cerilam]

The issue is still present in godot 4.4.
It's a pretty dumb and easy to fix problem to block the user for x minutes instead of printing a simple "use fmod() instead"

[Mickeon]

Alright, since it's so easy to fix, someone should feel free to make a PR about it so it can be reviewed

[Cerilam]

Ho yeah my message was pretty lame, sorry about that.
It wasn't meant to be malicious.
I'll check if I can make a PR for it

[Calinou]

There's already an open PR, as commented above. I rebased it yesterday and addressed review comments.