Support `width` configuration in `formatcp!`

[iilyak]

The standard format! macro supports with configuration https://doc.rust-lang.org/std/fmt/index.html#width

I am trying to format 0x0100 using "{:#06x}" however I am getting

failed to parse the format string at the character number 2,
       unknown formatting: "#06x"

When I remove 06 from the format (the resulting format is "{:#x}") I am getting 0x100 which is not what I want.

Is there a way to set with?

[rodrimati1992]

There is no way to set width, don't know how hard it'd be to implement such that it works like in std for all types.

[dzfranklin]

In the meantime could you remove the statement "The {}/{:} formatter works the same as in format"? I wasted a while assuming that meant I could pass it the same things as format! before I found this issue.