Earlier today, while I was going through the list of unconfirmed bugs, I 
came across what appears to be a longstanding bug in the arealight 
implementation.  Render the following scene in either v3.5 or v3.1 and note 
that the shadow on the right hand side of the sphere appears to be roughly 
cut off rather than smooth.

plane {y,0 pigment {rgb 0.5}}

sphere {y,1 pigment {rgb 0.75}}

camera {location <0,4,-8> look_at <0,0,0> rotate y*45}

light_source {y*10 rgb 1 area_light <5,0,5> <-5,0,-5> 16,16 adaptive 1 
jitter rotate z*45}

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