[Distutils] Metadata 2.0 and single-component version numbers

[Marcus Smith]

>
>
> My apologies. I misread N[.N]+ as the '+' meaning "one or more" (as in
>

maybe  N[(.N)+]  would be clearer.

all of (.N)+ is optional
but when it's present it can be  .N or .N.N or .N.N.N etc...
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