Hexadecimal codes, like #2faced, are interpreted as colors. For a long time now, I've wanted the ability to further shorten hexcodes.

Take for example the hexcode for the color black. It can be written as #000000 or #000. I think we should also be able to write #0 to represent black.

To take this a step further, we know #f16 is the shorthand for #ff1166, so why can't #16 be the shorthand for #161616?

In my ideal world:
#3 would be equivalent to #333333,
#7 would be equivalent to #777777,
#b4 would be equivalent to #b4b4b4,
#5d would be equivalent to #5d5d5d,
et cetera, et cetera.

This technique seems like an appropriate short(er)hand for hexcodes and would save a tiny bit of time and bytes.