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並前往https://softwareengineering.stackexchange.com/questions/197982/why-would-you-want-to-use-an-array-or-hash-as-hash-key-in-ruby

Why would you want to use an array, or hash as hash key in ...

E.g. in Ruby, arrays, hashes, sets define .hash and .eql? to hash by value. [See below for the "why?" part.] Now what about custom objects?

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