bug#47028: Discourage single-character package names

[Tobias Geerinckx-Rice]

[Inexcusably breaking thread because I lost the original.]

Mark,

> We have one notable exception in Guix: "r", which is 
> "grandfathered
> in" so-to-speak [...]

Very good point.  So grandfathered it didn't occur to me.

> [...] perhaps "r"should be whitelisted.

I agree.  Thanks for pointing it out!

T G-R