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One very obscure trick in ruby is the flip-flop operator. Never used it and I probably never will. There's an open issue to get rid of it[1]. Has anyone ever had a real use case for it?

[1]: https://bugs.ruby-lang.org/issues/5400

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You've never wanted a range of lines out of a file? It's a common Perl idiom.

It looks like this is not being treated as a range operator, but a flip-flop operator I've never heard of

That's the name of the operator, sure. One of the use cases of the flip-flop operator is selecting a range of lines in a file.

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