Another option would be {...}e< as an alternative to {...}$0=. It would only save 1 byte, but it would be O(N) as opposed to O(N log N), which would be nice for longer lists, and it could implicitly turn integers into ranges, which means the whole list never has to be kept in memory.
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Another option would be
{...}e<as an alternative to{...}$0=. It would only save 1 byte, but it would be O(N) as opposed to O(N log N), which would be nice for longer lists, and it could implicitly turn integers into ranges, which means the whole list never has to be kept in memory.