Zippers and pointers. #6
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* Also fixes ambiguous links in documentation * v1.1 bump.
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Both changes are relevant for parsing:
Zippers allow one-pass lookup followed up by an insertion to the same spot without holding the entirety of the key in memory. This solves the degenerate case of having to look up extremely long keys in parsers where the total key set is known beforehand.
Compressed pointers are cheaper keys for trees that never change shape. Mostly useful for precompilation, although there may be other uses.
Both handle rather rare side cases, so they're put in modules separate from the main ones. Both may be extended in the future, however I don't want to add unnecessary functionality to them.
Cursors have been removed from all modules since zippers perform roughly the same job.Additionally:
Fixes ambigous Haddock references;
Includes v1.1 waiting room #4;
Bumps to v1.1.