/** Full Unicode case folding (C + F), excluding Turkic mappings. */
export declare function caseFoldFull(input: string): string;
/** Normalize path-like entry names for collision detection. */
export declare function normalizePathForCollision(inputName: string, isDirectory?: boolean): string | null;
/** Canonical collision key: path normalization -> NFC -> full case fold -> NFC. */
export declare function toCollisionKey(inputName: string, isDirectory?: boolean): string;
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