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The &method style undergoes type erasure, is disallowed at typed: strict, and (IMO) isn't idiomatic ruby: https://sorbet.run/#%23%20typed%3A%20strict%0A%0Anumbers%20%3D%20%5B1%2C2%2C3%5D%0A%0AT.reveal_type%28numbers.map%20%7B%20String%28_1%29%20%7D%29%0AT.reveal_type%28numbers.map%28%26method%28%3AString%29%29%29