No unpaired surrogates in CESU-8.

index.html

@@ -602,7 +602,7 @@ <h1 class="p-name no-ref" id="title">The WTF-8 encoding</h1>
      <dt>Change history:
      <dd><span><a href="https://github.com/SimonSapin/wtf-8/commits/gh-pages">On GitHub</a></span>
      <dt>Last updated:
-     <dd><span>27 May 2015</span>
+     <dd><span>28 May 2015</span>
     </dl>
    </div>
 
@@ -827,9 +827,9 @@ <h3 class="heading settled" data-level="2.1" id="cesu-8"><span class="secno">2.1
   Therefore, CESU-8 is not a superset of <a data-link-type="dfn" href="#utf_8">UTF-8</a>.</p>
 
 
-  <p>It is unclear whether <a data-link-type="dfn" href="#unpaired-surrogate-byte-sequence">unpaired surrogate byte sequences</a>
-  are supposed to be <a data-link-type="dfn" href="#well_formed">well-formed</a> in CESU-8.
-  If so, they are encoded the same as in <a data-link-type="dfn" href="#wtf_8">WTF-8</a>.</p>
+  <p>CESU-8 is also a mapping on <a data-link-type="dfn" href="#utf_16">UTF-16</a> code units.
+  Therefore <a data-link-type="dfn" href="#unpaired-surrogate-byte-sequence">unpaired surrogate byte sequences</a> are <a data-link-type="dfn" href="#ill_formed">ill-formed</a> in CESU-8,
+  whereas supporting them is the entire point of <a data-link-type="dfn" href="#wtf_8">WTF-8</a>.</p>
 
 
 
@@ -1944,6 +1944,7 @@ <h2 class="heading settled" data-level="8" id="acknowledgments"><span class="sec
   Dylan Petonke,
   Henri Sivonen,
   James Graham,
+  Kevin Ballard,
   Mathias Bynens,
   Sam Tobin-Hochstadt,
   Tab Atkins.</p>

index.src.html

@@ -122,9 +122,9 @@ <h3 id=cesu-8>
   whereas <a>WTF-8</a>, like <a>UTF-8</a>, encodes them as sequences of four bytes.
   Therefore, CESU-8 is not a superset of <a>UTF-8</a>.
 
-  It is unclear whether <a>unpaired surrogate byte sequences</a>
-  are supposed to be <a>well-formed</a> in CESU-8.
-  If so, they are encoded the same as in <a>WTF-8</a>.
+  CESU-8 is also a mapping on <a>UTF-16</a> code units.
+  Therefore <a>unpaired surrogate byte sequences</a> are <a>ill-formed</a> in CESU-8,
+  whereas supporting them is the entire point of <a>WTF-8</a>.
 
   <!--
   CESU-8 was probably not designed,
@@ -869,6 +869,7 @@ <h2 id=acknowledgments>
   Dylan Petonke,
   Henri Sivonen,
   James Graham,
+  Kevin Ballard,
   Mathias Bynens,
   Sam Tobin-Hochstadt,
   Tab Atkins.