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458580cee2
See #2651 and a935a4f70c9c4c4a76009f9aee3bdaa1f7b9084e for more background. This speeds up `jj log` in a large repo with watchman enabled by around 9%: ``` $ hyperfine --sort command --warmup 3 --runs 20 -L bin \ jj-before,jj-after "target/release/{bin} -R ~/chromiumjj/src log" Benchmark 1: target/release/jj-before -R ~/chromiumjj/src log Time (mean ± σ): 788.3 ms ± 3.4 ms [User: 618.6 ms, System: 168.8 ms] Range (min … max): 783.1 ms … 793.3 ms 20 runs Benchmark 2: target/release/jj-after -R ~/chromiumjj/src log Time (mean ± σ): 713.4 ms ± 5.2 ms [User: 536.1 ms, System: 176.2 ms] Range (min … max): 706.6 ms … 724.7 ms 20 runs Relative speed comparison 1.11 ± 0.01 target/release/jj-before -R ~/chromiumjj/src log 1.00 target/release/jj-after -R ~/chromiumjj/src log ```