/**
 * Compares two header field values as returned by `getHeader` for equality
 * across the two sides of a proxy hop. The raw values cannot be compared
 * structurally: a single field line may be represented either as a string or
 * as a one-element array, and for repeated field lines (string[]) the
 * repository read path does not guarantee a stable order. Values are
 * normalized to a sorted array first; an empty array is treated as an absent
 * field.
 */
export declare function equalHeaderValues(a: string | string[] | undefined, b: string | string[] | undefined): boolean;
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