Improve performance for large messages across many chunks #130
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Recently ran into an issue with large payloads (megabytes in size) that arrived over many chunks. As the size increased, the time to process them seemed to increase exponentially. After investigating a bit, realized that each time a new chunk arrives, any data in the buffer from before gets re-parsed. Thus, for very large messages you might wind up re-parsing the early data many times.
This change adds a couple variables to track data that has already been processed to skip evaluating it multiple times.