211     STRING = 4  variable in Type
232     STRING = 7  # "foo"  variable in _MarkerType
351         if set(types) == {_MarkerType.STRING}:
352             return Type.STRING if len(types) == 1 else Type.STRINGS
443         if self.type is not Type.STRING:
469         if self.type not in (Type.STRING, Type.STRINGS):
541         if self.type not in (Type.PATH, Type.STRING):
579             if marker_type is _MarkerType.STRING:
654     STRING = 3  variable in _T
1259             elif tok.id == _T.STRING:
1260                 prop._add_marker(_MarkerType.STRING)
1349         if tok.id != _T.STRING:
2152         _T.STRING: r'"((?:[^\\"]|\\.)*)"',