I'm pretty sure this is http://trac.sagemath.org/sage_trac/ticket/11963, 
which changed the aspect ratio handling. The default is now 1.0:

sage: Graphics().aspect_ratio()
1.0

If you request 'automatic' then you get a plot of the specified 
width/height:

sage: g.show(figsize=[8,4], aspect_ratio='automatic')

I don't have a strong opinion about what the best default aspect_ratio is, 
but a warning/error if it conflicts with the chosen aspect_ratio seems in 
order.

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