Saver.entitizeAttrValue() doesn't honor SAVE_SUBSTITUTE_CHARACTERS setting

I'm formatting a XML Document using the following XMLOptions:

XmlOptions options = new XmlOptions();
options.setSavePrettyPrint();
XmlOptionCharEscapeMap escapes = new XmlOptionCharEscapeMap();
escapes.addMapping('<', XmlOptionCharEscapeMap.PREDEF_ENTITY);
escapes.addMapping('>', XmlOptionCharEscapeMap.PREDEF_ENTITY);
escapes.addMapping('&', XmlOptionCharEscapeMap.PREDEF_ENTITY);
escapes.addMapping('\'', XmlOptionCharEscapeMap.PREDEF_ENTITY);
escapes.addMapping('"', XmlOptionCharEscapeMap.PREDEF_ENTITY);
options.setSaveSubstituteCharacters(escapes);

This works when using content containing the escaped chars, but attribut values are not escaped:

<inventory>
<customer name1=">"/>
</inventory>

This should be:

<inventory>
<customer name1=">"/>
</inventory>

The reason for this is, that Saver.entitizeAttrValue() does not contain:

[....]
else if (isEscapedChar( ch ))
i = replace( i, _replaceChar.getEscapedString( ch ) );
[....]

This is only done in Saver.entitizeContent().