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Normative: Clarify that case conversion is context-sensitve #932

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Jul 11, 2017
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Normative: Clarify that case conversion is context-sensitve #932

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Normative: Clarify that case conversion is context-sensitve
littledan Jun 13, 2017
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littledan Jun 15, 2017
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8 changes: 3 additions & 5 deletions spec.html
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Expand Up @@ -28388,10 +28388,8 @@ <h1>String.prototype.toLowerCase ( )</h1>
1. Let _O_ be ? RequireObjectCoercible(*this* value).
1. Let _S_ be ? ToString(_O_).
1. Let _cpList_ be a List containing in order the code points as defined in <emu-xref href="#sec-ecmascript-language-types-string-type"></emu-xref> of _S_, starting at the first element of _S_.
1. For each code point _c_ in _cpList_, if the Unicode Character Database provides a language insensitive lower case equivalent of _c_, then replace _c_ in _cpList_ with that equivalent code point(s).
1. Let _cuList_ be a new empty List.
1. For each code point _c_ in _cpList_, in order, append to _cuList_ the elements of the UTF16Encoding of _c_.
1. Let _L_ be a String whose elements are, in order, the elements of _cuList_.
1. Let _cuList_ be a List where the elements are the result of toLowercase(_cplist_), according to the Unicode Default Case Conversion algorithm.
1. Let _L_ be a String whose elements are the UTF16Encoding of the code points of _cuList_.
1. Return _L_.
</emu-alg>
<p>The result must be derived according to the locale-insensitive case mappings in the Unicode Character Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive mappings in the SpecialCasings.txt file that accompanies it).</p>
Expand Down Expand Up @@ -28419,7 +28417,7 @@ <h1>String.prototype.toString ( )</h1>
<emu-clause id="sec-string.prototype.touppercase">
<h1>String.prototype.toUpperCase ( )</h1>
<p>This function interprets a String value as a sequence of UTF-16 encoded code points, as described in <emu-xref href="#sec-ecmascript-language-types-string-type"></emu-xref>.</p>
<p>This function behaves in exactly the same way as `String.prototype.toLowerCase`, except that code points are mapped to their _uppercase_ equivalents as specified in the Unicode Character Database.</p>
<p>This function behaves in exactly the same way as `String.prototype.toLowerCase`, except that the String is mapped using to toUppercase algorithm of Unicode Default Case Conversion.</p>
<emu-note>
<p>The `toUpperCase` function is intentionally generic; it does not require that its *this* value be a String object. Therefore, it can be transferred to other kinds of objects for use as a method.</p>
</emu-note>
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