This page documents a user-defined function that you can copy and paste into your addon. Replace PREFIX with your addon or lib prefix to avoid conflicts between different versions of these functions.
User defined functions

Takes a RGB value set (0-255) and converts it into a hex string.

local function RGBToHex(r, g, b)
	r = r <= 255 and r >= 0 and r or 0
	g = g <= 255 and g >= 0 and g or 0
	b = b <= 255 and b >= 0 and b or 0
	return string.format("%02x%02x%02x", r, g, b)
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