As currently defined, psd=u seems to contain no information and be identical to no token. I see no value in defining a tag that has no meaning.
It could optionally be defined to mean "this is an organizational subdomain which will lead to a psd=n tag". Then if the Tree Walk ends on anything other than a psd=n tag, we have a PERMERROR. This type of tag might be useful as a warning to PSL uses when the PSL is known to have an unwanted entry causing the PSL result to be an organizational subdomain. But unless that redefinition is desirable, I suggest dropping psd=u completely. DF
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