Check in the libxslt roll script.

third_party/libxslt/src/libxslt/numbers.c

 /*
  * numbers.c: Implementation of the XSLT number functions
  *
  * Reference:
  *   http://www.w3.org/TR/1999/REC-xslt-19991116
  *
  * See Copyright for the status of this software.
  *
  * daniel@veillard.com
  * Bjorn Reese <breese@users.sourceforge.net>
@@ skipping 1341 matching lines @@
             j += len - 1;       /* length of symbol less length of escape */
         } else
             xmlBufferAdd(buffer, &pchar, 1);
     }
 
     *result = xmlStrdup(xmlBufferContent(buffer));
     xmlBufferFree(buffer);
     return status;
 }