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Yuya Nishihara f21c078249 revset: ad-hoc optimization for range queries containing unwanted wanted heads
In my linux stable mirror, this makes the default log revset evaluation super
fast. immutable_heads(), if configured properly, includes many historical
branch heads which are also the visible heads.

revsets/immutable_heads()..
---------------------------
0     12.27     117.1±0.77m
3      1.00       9.5±0.08m
2024-02-22 23:26:29 +09:00
..
bench-revsets-git.txt
fake-diff-editor.rs
fake-editor.rs