Fix iterator_to_array return type with generators
#3652
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Generators allow any type for its keys. When passed to
iterator_to_array(), the keys are coerced to string or int where possible. For non-scalar keys, the function throws.Current PHPStan behaviour: https://phpstan.org/r/2489fc17-69f8-4e75-894a-48e9cb1b211f
Expected behaviours: