/**
 * Conservative, deterministic case-fold key for cross-platform collision
 * refusal. Upper-then-lower catches multi-code-point folds such as ß -> ss and
 * final sigma -> sigma. NFKC intentionally over-rejects compatibility aliases;
 * it is never used to rewrite a repository path.
 */
export declare function portableCaseFold(value: string): string;
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