Swift – Stored values order is completely changed in Dictionary

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This is because of the definition of Dictionaries:

Dictionary

A dictionary stores associations between keys of the same type and values of the same type in an collection with no defined ordering.

There is no order, they might come out differently than they were put in.
This is comparable to NSSet.

Edit:

NSDictionary

Dictionaries Collect Key-Value Pairs. Rather than simply maintaining an ordered or unordered collection of objects, an NSDictionary stores objects against given keys, which can then be used for retrieval.

There is also no order, however there is sorting on print for debugging purposes.

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