/** Vocabulary-derived bounds for ordinary (non-special) o200k_base encoding.
 * Tests validate these against every shipped token, so a vocabulary update
 * cannot silently turn the fast acceptance path into a byte-count heuristic.
 */
export declare const O200K_MAX_TOKEN_BYTES = 128;
export declare const O200K_UNIFORM_ASCII_MAX_BYTES: ReadonlyMap<number, number>;
export declare function provesTokenBenefit(before: string, beforeBytes: number, afterBytes: number): boolean;
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