add functions Safe\*val

[frederic100]

[str|int|bool|float]val PHP functions generate phpstan errors (these errors appear at level 9 and are legitimate) (source: phpstan/phpstan#9295 ).

Would it be interesting to add them to Safe ?

[shish]

Scanning that discussion, I'm not sure how Safe would help? "passing a mixed to a function which only accepts a few specific types" seems like a PHP error rather than Safe's usecase of "turn functions-which-return-false-on-error into functions-which-throw-exceptions-on-error" -- feel free to comment with more info if I'm missing something