Weak References Strongly Held

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Ruby’s standard library is full of little-known… well, gems of interesting code – which might not be needed on a daily basis, but are super-useful when required. From continuation and etc to tsort and weakref, learning about them means not only they might save you one day, but also make you a better developer (even if by researching the question ‘why on Earth would anyone package such a thing…?’ Come and learn about the libraries you’re already using!