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Ought to be faster than our naive array-based approach. Especially for the glyph cache, which has a solid amount of elements, and is mostly cache hits. (There are few things worse for performance in Lua than table.remove @ !tail and table.insert @ !tail, which this was full of :/). DocCache: New module that's now an actual Cache instance instead of a weird hack. Replaces "Cache" (the instance) as used across Document & co. Only Cache instance with on-disk persistence. ImageCache: Update to new Cache. GlyphCache: Update to new Cache. Also, actually free glyph bbs on eviction.