It’s part of a discussion appended to the etymology section in the word’s entry in the OED. It concludes: “As the word is both etymologically and phonetically one, it is undesirable to treat its graphic forms as differing in signification.”
with both parts: I tend to write grey for light and cool and gray for dark and warm, but they're two spellings of the same word denoting exactly the same range of colors.
no subject
I have to agree