Does it keep the www?

No. www. is stripped and the bare domain such as example.com is returned.

Are subdomains included?

Yes. Both example.com and sub.example.com are treated as distinct domains.

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DOMAINS

Does it keep the www?: No. www. is stripped and the bare domain such as example.com is returned.
Are subdomains included?: Yes. Both example.com and sub.example.com are treated as distinct domains.