speedups: rescue_vs_respond_to: true module_eval: true shuffle_first_vs_sample: true for_loop_vs_each: true each_with_index_vs_while: false map_flatten_vs_flat_map: true reverse_each_vs_reverse_each: true select_first_vs_detect: true sort_vs_sort_by: true fetch_with_argument_vs_block: true keys_each_vs_each_key: true hash_merge_bang_vs_hash_brackets: true block_vs_symbol_to_proc: true proc_call_vs_yield: true gsub_vs_tr: true select_last_vs_reverse_detect: true getter_vs_attr_reader: true setter_vs_attr_writer: true