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A general description is here.
‘iconv(sub = "Unicode")’ now zero-pads to four (hex) digits, rather than to 4 or 8. (This seems to have become the convention once Unicode restricted the number of Unicode points to 2^31 - 1 and so will never need more than 6 digits.)
Hexadecimal string colour specifications are now accepted in short form, so, for example, we can use ‘"#123"’, which is equivalent to ‘"#112233"’.
Thanks to MikeFC for the original idea and Ella Kaye, Malcolm Barrett, George Stagg, and Hanne Oberman for the patch.