Add adaptive quicklist fill factor
Fill factor now has two options: - negative (1-5) for size-based ziplist filling - positive for length-based ziplist filling with implicit size cap. Negative offsets define ziplist size limits of: -1: 4k -2: 8k -3: 16k -4: 32k -5: 64k Positive offsets now automatically limit their max size to 8k. Any elements larger than 8k will be in individual nodes. Positive ziplist fill factors will keep adding elements to a ziplist until one of: - ziplist has FILL number of elements - or - - ziplist grows above our ziplist max size (currently 8k) When using positive fill factors, if you insert a large element (over 8k), that element will automatically allocate an individual quicklist node with one element and no other elements will be in the same ziplist inside that quicklist node. When using negative fill factors, elements up to the size limit can be added to one quicklist node. If an element is added larger than the max ziplist size, that element will be allocated an individual ziplist in a new quicklist node. Tests also updated to start testing at fill factor -5.
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