[php-src] Issue #8296: Numeric casts must emit a warning it they do not make sense

Issue: https://github.com/php/php-src/issues/8296 Comment Author: bwoebi While we warn when casting an array to a string, this is about preventing the whole class of arrays, and not specific patterns of arrays (like with strings where numerical ones would be allowed). To get a checked cast of a string to a number, I'd recommend the one-char variant, prepending a + sign. Given that there is a short way to do a checked conversion to number (plus sign) - and a longer (the cast) unchecked version, I do not think there's a need for a change. In fact it's a good thing that there exists a (relatively easy) way to do unchecked casts "just squeeze that into a number". It's a safe way of doing that which existed since very old times and should stay. A common use case for int casts is taking (possibly client-side validated) user inputs for example. You do not really want to break this common scenario.