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By removing the 'supported' keyword from the detection methods and only relying on a cached settings.LANGUAGES, the speed of said methods has been improved; around 4x raw performance. This allows us to stop checking Python's incomplete list of locales, and rely on a less restrictive regular expression for accepting certain locales. HTTP Accept-Language is defined as being case-insensitive, based on this fact extra performance improvements have been made; it wouldn't make sense to check for case differences.