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Date: Sat, 9 Jan 2016 16:41:53 -0500
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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: [geda-user] (draw on insulating layers, gerber clear polarity)
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> So clear polarity in gerber files does not work properly?

I'm going to say "it depends" here.  There are things that you think
you can do in gerber using layer polarities, that fabs will get wrong.
We chose to solve the problem (and/or ambiguity) by avoiding polarity
completely.  We do all the pos/neg/pos math inside pcb and spit out
only the results.

Whether to blame the gerber spec, or lazy software at the fabs, is up
to you :-)