getRegistrableDomain has unexpected behavior when given URLs with trailing paths

[miloprice]

If you give it "example.com/path", or "example.com/", for example, the trailing / and anything after it are left in as part of the registrable domain. This actively causes problems if you send in a path directly to a filename with an extension (e.g., "example.com/path/image.jpg") because the method will interpret "com/path/image" as the domain name portion (and ".jpg" as the tld).

[malkusch]

Thank you for the report. Before I take action I need to understand what disallowed_STD3_valid means.

[malkusch]

Ok, now I see. / was valid in IDNA2003, but is now with IDNA2008 no more valid. I'll take care of that.

[HatScripts]

Still having this issue on 2.2.0.

In addition, getRegistrableDomain returns the same string as the input URL when said URL begins with "https://" (Though not for URLs with subdomains);