Php-cs-fixer: Add lowercase hints fixer

[Slamdunk]

-function foo(sTrIng $str): sTrIng {}
+function foo(string $str): string {}

-function foo(ITERABLE $arr): ITERABLE {}
+function foo(iterable $arr): iterable {}

-function foo(Int $num): Int {}
+function foo(int $num): int {}

-function foo(fLOAT $num): fLOAT {}
+function foo(float $num): float {}

[julienfalque]

Maybe in type castings as well:

-$foo = (sTrInG) $foo;
+$foo = (string) $foo;

[Slamdunk]

There is already https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/2.10/src/Fixer/CastNotation/LowercaseCastFixer.php for that

[julienfalque]

Ah right, I searched in the Casing namespace only :)

Then I would deprecate this one in favor of the new one, which would cover both type hints and type castings, WDYT?

[Slamdunk]

I'm ok: before spending time on code I need @keradus feedback if he's ok with this approach.

[SpacePossum]

better not call it lowercase something, as you could fix the casing of stdClass (and other predefined classes as well)

[keradus]

If we are able to prepare general solution that will fix casing everywhere for built-in types, I'm :+1:
Like we do for true/false/null constants, we don't care where they are used, we always fix casing.

[Slamdunk]

@SpacePossum this should be tagged with has PR