I cited the case of an argument color already in the text for Zig... in fact, that's conditionally a color depending on what is passed, which is even more sophisticated then an argument merely being unconditionally a color.

What some people want to do is call every argument a "color", that is, I changed this function to have to take a Username and now it's Username-colored is the claim. I supposed I should have made that more clear. This provides a definition where that is not the case.

Global context is absolutely a color. All global contexts are probably the same color, as you can put them all in one GlobalContext object and add new fields to that object, or no color if you make them global variables instead.

GetUserByUsername needing a username isn't a color because that's just what the function does, but GetFontSize needing the current username (to look up their preferences) is one if you don't make it a global variable.