colour<-lookup

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colour<-lookup

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colour <-lookup: [name|int], red=[0..360], green=[0..255], blue=[0..255], alpha=[0..255], model=[{rgb,hsv}] -> colour

Return an existing colour from @colours matching the arguments, or fail. Used internally to deduplicate equivalent colours; mirrors the signature of colour->initialise. A lookup from RGB values never returns a theme colour, as its value changes with the theme.