[plt-scheme] What is the "right way"to define keyword arguments in @defproc statements?

Grant Rettke wrote:
> What is the "right way"to define keyword arguments in @defproc statements?
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Based on documentation of @defproc and usage in official documentation,

(keyword id contract default)

e.g.,

(#color  text-color (symbols 'black 'fuchsia 'mauve) 'black)

This would be formatted as an optional keyword argument. Leave out the 
default value to have it formatted normally.

Yavuz