PLINGEN attribute explained
it's explained here:
@@ -92,7 +92,7 @@ User Defined Point Format Codes
dxf.flags Value Description
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LWPOLYLINE_CLOSED 1 polyline is closed
- LWPOLYLINE_PLINEGEN 128 ???
+ LWPOLYLINE_PLINEGEN 128 linetype is generated across the points
============================== ======= ===========
.. attribute:: dxf.const_width
