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There are only 5 XML entities to escape: http://stackoverflow.com/questions/1091945/what-characters-do-i-need-to-escape-in-xml-documents/1091953#1091953
This package escapes 4 of them but it doesn't escape apostrophes (
'
). This PR escapes apostrophes.I went with
'
as the escape sequence. The alternatives are'
or'
. The former is not valid HTML 4 (see ruby/ruby@538bd3c) and the latter is apparently not as widely supported (see ruby/ruby@bbb6b5e#commitcomment-1800099).