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Improve fixer performance #4030

Job	Run time
code_coverage	31s
frankenstein	35s
race_detector	2m 54s
Matrix (ubuntu-latest, linux, true)	2m 3s
Matrix (macos-15-intel, macos-intel, false)	3m 4s
Matrix (macos-26, macos-arm64, true)	2m 5s
Matrix (windows-latest, windows, true)	1m 19s
	12m 31s

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