ext/gmp: Emit deprecation for precision-losing float RHS in ** / << / >>

[LamentXU123]

I found this TODO message in the code base

For PHP 8.3 and up use zend_try_get_long()

Ah, so using zend_try_long() here will cause some precision loss and should be fixed after 8.3. So I created this PR targeting 8.4. I don't sure if this worth a NEWS entry. Also may need to merge this PR to other branches since I don't have access :)

cc @Girgias

[devnexen]

I think a decision (aka RFC) needs to be made about it first, not entirely sure though.

[LamentXU123]

I think a decision (aka RFC) needs to be made about it first, not entirely sure though.

There are comments about this in the original code base so maybe this is some sort of TODO task, I think the correct behavior is decided when the comment is written.

Anyway, the code is written in PHP 8.2.6 and I guess the original idea is to correct the behavior after 8.3 when we have the corresponding try method, and people might just forget it :)

[devnexen]

oh I do not deny the correctness of it, just talking about this as a whole procedure but let s wait the maintainer's opinion ;)