Is there any objection to changing exactRGBA to be more lenient?  I'd 
be just as happy to do that.

I can imagine cases in which it would be important to the user to be 
able to write a precise RGBA value into the framebuffer.  For an 
8-bit/channel framebuffer, glColor4ub() is the natural solution (and 
this works fine today).  For a deeper framebuffer, glColor4us() would 
be next.  So I can understand the motivation of the spec.

-Brian

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