Converting an integer to a string with std.format.

[Per Nordlöw]

On Monday, 7 January 2019 at 12:17:37 UTC, Stefan Koch wrote:
> I've written my own itos function because using std.conv was 
> too expensive.
> see 
> https://github.com/UplinkCoder/dmd/blob/newCTFE_reboot_20741/src/ctfe/bc_common.d#L95

Thanks!