InstantCoder: stop boxing Longs unnecessarily #3270
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In encode, and similar in decode, the existing path goes
Instant->long (inside of converter)
long->Long (returned from converter)
Long->long (inside of LongCoder).
This is a relatively small improvement, but as we encode timestamps
for every single element, this is likely to make a difference in
lightweight stages of pipelines.
R: @lukecwik @bjchambers