/** o200k_base is a local estimate, NOT a claim about an unknown model's billing
 * tokenizer. Require a margin, count only changed bounded units, and memoize the
 * decision. Unknown encodings / oversized units require substantial byte savings.
 * Loading lazily keeps untouched and null-proxy traffic free of tokenizer work.
 */
export declare function tokenBenefit(before: string, after: string): boolean;
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