89 mutants tested: 59 caught, 30 unviable (type system rejects them), 0 missed. Added mutants dev-dep for #[mutants::skip] on legacy-msrv dead code. Upgraded cargo-mutants to v27. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
89 mutants tested: 59 caught, 30 unviable (type system rejects them), 0 missed. Added mutants dev-dep for #[mutants::skip] on legacy-msrv dead code. Upgraded cargo-mutants to v27. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>