Guard against copying into self#215
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Use the standard Ruby pattern of guarding against calling initialize_copy against self, see https://github.com/ruby/ruby/blob/11e3c78b61da705c783dd12fb7f158c0d256ede0/object.c#L652
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Use the standard Ruby pattern of guarding against calling initialize_copy against self, see https://github.com/ruby/ruby/blob/11e3c78b61da705c783dd12fb7f158c0d256ede0/object.c#L652