Fix ArrayCountValuesDynamicReturnTypeExtension

[VincentLanglet]

$type->toArrayKey() instanceof ErrorType is not the right check cause true, false, 1.0, null, ... are ignored by the function. It has to be an int or a string.

And numeric string wasn't casted into int when used as array key.

[staabm]

Looks like it should be $allowedValues->isSuperTypeOf(...)

[VincentLanglet]

Looks like it should be $allowedValues->isSuperTypeOf(...)

How you deal with something like "int|null" ?
I dont see the benefit with keeping the unionType check and calling filterType on it rather than doing an intersection like I did.

[staabm]

I see now, that you also need the normalized result. its not just a check for compatibility. my suggestion did not fit that.

[mad-briller]

good catches, didn't think to try other scalar types 👍