ls: -T=0xff should be rejected while -T 0xff is accepted

[oech3]

> mkdir a
> cd a
> '/home/a/bin/gnu9.11/ls' -T=0xff
ls: invalid tab size: `=0xff'
> '/home/a/bin/gnu9.11/ls' -T 0xff
> uu-ls -T=0xff
> uu-ls -T 0xff

[HackingRepo]

no, that is expectedf behavior look like @oech3, because -T= is a valid thing clap accepts it gnu rejects it because it parser different, because ls use clap

[oech3]

Do you say that this is extension instead of bug?