♻️ Reorganize SequenceSet internals
#568
Merged
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This should not change any code, except for the order in which the methods (and constant) are defined.
This also adds vim foldmarkers. In general, I think that needing manual foldmarkers is a code smell, and this is no different. It usually means some new classes and objects should be extracted. I've avoiding extracting new classes mostly for performance reasons: new objects require extra allocations, and I want that change to be justified by accompanying some performance improvements. (On the other hand, subclassing Array will allow us to better organize the code while avoiding extra allocations.)
But also, this is preparatory for much bigger changes, which almost certainly will introduce new classes for the internal data structures. (See #484.)