avoid unnecessary overhead when parsing large messages #9
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This is a verbatim borrowing of a PR from the upstream repo. A customer pointed out the issue and has found that the fix greatly improved performance for them. Basically, the previous logic was re-scanning already-parsed content for no goo reason when a long message arrived in many chunk.
We have diverged enough from upstream at this point that I don't want to try to pull from it right now, although we should still try soon.