Returns the bare lowercase label of a .skr name: 'Alice.skr' and ' alice ' both become
'alice'. Throws a plain Error when the result is empty or still contains a dot, so subdomains,
other TLDs and doubled suffixes such as 'alice.skr.skr' are rejected.
Returns the bare lowercase label of a
.skrname:'Alice.skr'and' alice 'both become'alice'. Throws a plainErrorwhen the result is empty or still contains a dot, so subdomains, other TLDs and doubled suffixes such as'alice.skr.skr'are rejected.