To get rid of the intermediate [0], use
'properties': {KEY: 'props', CONVERTER: self._convertToUnique}, 'entry-local-roles': {KEY: 'elrs', DEFAULT: ((),), CONVERTER: self._convertToUnique},
Currently the converter is called after setting the default. I guess it would be better not to call the converter in that case.
FYI: I changed that on HEAD and CMF-1_5-branch. A less cryptic
DEFAULT: ()
should work now.
Cheers, Yuppie
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