DaWorm wrote on Thu, 15 Oct 2015:
What if someone is storing a set in a file, or a stream? Old version saves it, new version reads it, and all of the sudden the data isn't in the same format.
Support for larger sets would not change the format of smaller sets. The amount of space a set takes up depends on the element type of the set and the {$packset x} setting. Neither of these would automatically change for existing sets.
That said, sets for 256 elements already take up 32 bytes. Larger sets will usually be quite sparse, which means that just increasing the size will end up wasting a lot of memory. It would probably be better to use a dedicated bitmap class (generic or not) instead that is more clever than just using a bit array (although you could still do that in the class, using a bitpacked array of boolean).
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