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Oran Agra authored
The callback approach we took is very efficient, the module can do any filtering of keys without building any list and cloning strings, it can also read data from the key's value. but if the user tries to re-open the key, or any other key, this can cause dict re-hashing (dictFind does that), and that's very bad to do from inside dictScan. this commit protects the dict from doing any rehashing during scan, but also warns the user not to attempt any writes or command calls from within the callback, for fear of unexpected side effects and crashes.
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