Re: [whatwg/encoding] Add get an encoder and encode or fail for URLs (#238)

@annevk commented on this pull request.



> +<p>To <dfn export>encode or fail</dfn> an I/O queue of scalar values <var>ioQueue</var> given an
+<a for=/>encoder</a> <var>encoder</var> and an I/O queue of bytes <var>output</var>, run these
+steps:
+
+<ol>
+ <li><p>Let <var>potentialError</var> be the result of <a>running</a> <var>encoder</var> with
+ <var>ioQueue</var>, <var>output</var>, and "<code>fatal</code>".
+
+ <li><p>If <var>potentialError</var> is an <a>error</a>, then return <a>error</a>'s
+ <a>code point</a>'s <a for="code point">value</a>.
+
+ <li><p>Return null.
+</ol>
+
+<div class=note>
+ <p>This is a legacy hook for URLs. The caller will have to keep an <a for=/>encoder</a> alive as

See above.

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