<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def line_join_type(self):
 """Join type, one of `miter`, `round`, `bevel`."""

        key = self._data.get(b'strokeStyleLineJoinType').enum
        return self.STROKE_STYLE_LINE_JOIN_TYPES.get(key, str(key))