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I’ve found the -@ operator redefinition in Rails/ActiveSupport:
https://github.com/rails/rails/blob/master/activesupport/lib/active_support/duration.rb#L33
Can you tell me what does it mean?
-@and+@are simply the method names for unary-and+. If you want to redefine them, invoke them as methods, etc., that’s how you need to refer to them to distinguish them from binary-and+.