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f462576ac2
Make `tracing` either `undefined` or the same namespace as before.
Switching all calls to `tracing?.___` means that there is no cost for
a call or the arguments when tracing is not used. Comparing two runs
without tracing (27 runs, drop 5+5, avg rest) I get:
master:
42.59s user 1.00s system 165% cpu 26.372 total
changed:
42.01s user 0.982 system 165% cpu 26.039 total
(Makes it all private, so no api changes.)