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When decoding a stream, the decode buffer is often grown multiple times, its byte size increasing like so: 512, 1024, 2048, etc. This patch estimates the minimum size in advance (using the length of the encoded stream), often allowing the smaller sizes to be skipped. It also renames numerous |length| variables as |maybeLength| to make it clear that they can be |null|. I measured this change on eight documents. This change reduces the cumulative size of decode buffer allocations by 0--32%, with 10--20% being typical. This reduces peak RSS by 10 or 20 MiB for several of them. |
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