docs: function parse_select_fields(ObjType, traits) {
  	debug.assert(ObjType).is('function');
  	debug.assert(traits).ignore(undefined).is('object');
  	return ARRAY(traits.fields).map(function(f) {
  		return _parse_predicate_key(ObjType, {'traits': traits, 'epoch':false}, f);
  	}).valueOf();
  }