[metapost] rfc: consistent color values

[Boguslaw Jackowski]

Taco:
>It looks like this can be classified as an oversight (bug),
>because the documented behaviour is:
>
>"... all components are snapped back to the [0, 1] range
>      when a color is given in a PostScript output file."
>
>so clearly the picture iteration should have reported the
>values with their negative components still intact.

Dan:
> I think this should be classified as a documentation bug. I would
> prefer changing the documentation to changing the behavior. When
> I examine the color of picture components, I want to see the color it
> would get at shipout.

What about controlling this behavior by a variable, say, `truecolors',
similarly to the controlling of bounding boxes usin `truecorners'? 
For example:
   truecolors=0 -- current behavior
   truecolors=1 -- colors are reduced to teh interval [0,1]
                   prior to the shipping the picture to PostScript
   truecolors=2 -- actual colors are shipped to PostScript

Cheers -- Jacko

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