> Auto setting strictness for every file in your project and checking for it in CI clears the issue, but that becomes another boilerplate you’re adding to your system
There was this RFC[0] but it seems to have fizzled.
> And it still doesn’t work for native functions.
The page states: 'Function calls from within internal functions will not be affected by the strict_types declaration' (emphasis mine). Outside of array_map I don't think this happens all that much.
> So in the end, the best option is to _not_ type scalar parameters, and do the strict check manually and throw your own TypeError, inside your function instead.
That sounds awful. Why not install a nice static analyzer like phpstan or psalm and never think about it again?