Add empty collection return value mutations #1526
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Add mutations that replace collection-returning expressions with empty values. * to_a/to_ary calls mutate to empty array * to_h/to_hash calls mutate to empty hash * to_s/to_str calls mutate to empty string * String literals mutate to empty string
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Add mutations that replace collection-returning expressions with empty values.
to_a/to_arycalls mutate to empty arrayto_h/to_hashcalls mutate to empty hashto_s/to_strcalls mutate to empty string