/**
 * Extracts the locale from a given URL using native URLPattern.
 *
 * The built-in default `/:locale/...` routing is case-insensitive because it
 * canonicalizes the first path segment with `toLocale()`. Custom `urlPatterns`
 * keep URLPattern's normal exact matching semantics for path segments.
 *
 * @param {URL|string} url - The full URL from which to extract the locale.
 * @returns {Locale|undefined} The extracted locale, or undefined if no locale is found.
 */
export function extractLocaleFromUrl(url: URL | string): Locale | undefined;
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