| @@ -977,10 +977,14 @@ e.g. ``'utf-8'`` is a valid alias for the ``'utf_8'`` codec. |
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Some common encodings can bypass the codecs lookup machinery to |
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improve performance. These optimization opportunities are only |
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- recognized by CPython for a limited set of aliases: utf-8, utf8, |
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- latin-1, latin1, iso-8859-1, mbcs (Windows only), ascii, utf-16, |
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- and utf-32. Using alternative spellings for these encodings may |
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- result in slower execution. |
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+ recognized by CPython for a limited set of (case insensitive) |
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+ aliases: utf-8, utf8, latin-1, latin1, iso-8859-1, iso8859-1, mbcs |
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+ (Windows only), ascii, us-ascii, utf-16, utf16, utf-32, utf32, and |
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+ the same using underscores instead of dashes. Using alternative |
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+ aliases for these encodings may result in slower execution. |
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+ |
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+ .. versionchanged:: 3.6 |
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+ Optimization opportunity recognized for us-ascii. |
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Many of the character sets support the same languages. They vary in individual |
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characters (e.g. whether the EURO SIGN is supported or not), and in the |