fix(support): make Arr\forget_values and Arr\forget_keys mutable
#1215
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This pull request fixes a typo in the docblocks of
Arr\remove_valuesregarding its mutability, and more importantly, actually fixes the mutability ofArr\forget_valuesandArr\forget_keys.Those two functions were meant to be mutable, and have immutable counterparts (
Arr\remove_valuesandArr\remove_keys), but the first argument was not passed as reference.Tests have been added to cover them.