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Message: [QUOTE="Robert Klemme, post: 4452440"] Yes, it's a special optimization for string keys. You can get your original out if you freeze it before putting it into the hash. :-) In fact, that might be a performance optimization if you put *a lot* string keys into the hash. Because copying an instance is relatively expensive this pattern was not adopted generally, i.e. you have to take care of Array and other keys yourself. Note also, that you need to rehash if you change your array instance after using it as Hash key. Kind regards robert [/QUOTE]