unify the code for filter methods (and speed up #reject!)
#6236
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the worst case for `Array#reject!` (i.e. a proc always returning `true`) is at least 5x worse than the worst case for `Array#select!` (proc always returning `false`) this commit unifies these implementations and inlines the (effective) call of `#select!` in `#keep_if` and `#reject!` in `#delete_if`
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the worst case for
Array#reject!(i.e. a proc always returningtrue) is at least 5x worse than the worst case forArray#select!(proc always returningfalse)this commit unifies these implementations and inlines the (effective) call of
#select!in#keep_ifand#reject!in#delete_if