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Cache tick! command marker to avoid per-heartbeat Symbol#to_s allocation#398

Merged
ianks merged 4 commits into
mainfrom
heartbeat-tick-zero-alloc
Apr 20, 2026
Merged

Cache tick! command marker to avoid per-heartbeat Symbol#to_s allocation#398
ianks merged 4 commits into
mainfrom
heartbeat-tick-zero-alloc

Use FakePipe instead of StringIO in heartbeat tests

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