eofill: potential improvement

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Good afternoon from the Czech Republic,

Firstly, thank you very much for constant improvement of the Metapost 
tool, it's very helpful!
I just wanted to let you know about this.  The PostScript language can 
use eofill (as well as SVG in the form of fill-rule="evenodd").  The 
unfill command in Metapost is using colour, that might be an obstacle in 
some cases.  I enclose an example and an ideal output.

I just wanted to let you know about this potential improvement!

Best regards, Pavel


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