[racket] 2htdp/image pen-join used only for polygons?

From: John Clements (clements at brinckerhoff.org)
Date: Thu Jun 2 14:03:18 EDT 2011

It appears to me that the pen-join property in the 2htdp/image library is used only for polygons, and cannot be used for sequences of curves.  Is this correct?
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