UISelectOne and UISelectMany fail with custom converter that returns java.lang.String from getAsObject() method.

The problem seems to be in javax.faces.component._SelectItemsUtil.matchValue(FacesContext context, Object value, Iterator selectItemsIter, _ValueConverter converter) method.

Line 63-72:
Object itemValue = item.getValue();
if(converter != null && itemValue instanceof String)

{ itemValue = converter.getConvertedValue(context, (String)itemValue); }

if (value==itemValue || value.equals(itemValue))

{ return true; }

If item's value is java.lang.String then this code does duplicate conversion making matchValue() return false and subsequently resulting in error in calling method (validateValue() in javax.faces.component.UISelectOne and javax.faces.component.UISelectMany).