specialize impl of ToString on bool
#106662
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Rollup of 14 pull requests Successful merges: - rust-lang#105194 (Add comment to cleanup_kinds) - rust-lang#106521 (remove E0280) - rust-lang#106628 (Remove unneeded ItemId::Primitive variant) - rust-lang#106635 (std sync tests: better type name, clarifying comment) - rust-lang#106642 (Add test for rust-lang#106062) - rust-lang#106645 ([RFC 2397] Initial implementation) - rust-lang#106653 (Fix help docs for -Zallow-features) - rust-lang#106657 (Remove myself from rust-lang/rust reviewers) - rust-lang#106662 (specialize impl of `ToString` on `bool`) - rust-lang#106669 (create helper function for `rustc_lint_defs::Level` and remove it's duplicated code) - rust-lang#106671 (Change flags with a fixed default value from Option<bool> to bool) - rust-lang#106689 (Fix invalid files array re-creation in rustdoc-gui tester) - rust-lang#106690 (Fix scrolling for item declaration block) - rust-lang#106698 (Add compiler-errors to some trait system notification groups) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Fixes #106611
Specialize
boolsToStringimpl by copying it fromDisplay. This is a significant optimization as we avoid lots of dynamic dispatch. AFAIK, this doesn't require a API Change Proposal as this doesn't regress existing code and can be undone without regressing code.