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SeriesLong: remove unneeded mutex #2007
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AFAICT all uses of series are already protected or single threaded. There isn't a need to keep a lock at this low level. This will save 24 bytes per instance of SeriesLong (of which there are many for large clusters). Removing the mutex also removes the unneeded cost of synchronization (about 18% improvement).
Note: Chunk is already marked as not concurrency safe. Also, there are already accesses to Series.T which would be unsafe (if AggMetric didn't already have a lock).