:{{para|template doc demo|true}} does not prevent error messages; it only prevents this page from being included in {{cl|CS1 errors: dates}}. To get rid of the error message, those citations will require a valid date: {{para|date|Date}} is not a valid date; or, the citations should be handwritten without using the templates.
:—[[User:Trappist the monk|Trappist the monk]] ([[User talk:Trappist the monk|talk]]) 22:37, 25 April 2017 (UTC)
== Fix bug causing spurious "Check |url= value" warnings on single-letter subdomains of 4-or-more-letter gTLDs (e.g. "z.cash") ==
The is_domain_name function incorrectly considers <single letter>.<4-or-more-letter gTLD> not to be a valid ___domain.
See https://en.wikipedia.org/wiki/Zcash#References for an example; "z.cash" is incorrectly considered not to be a valid ___domain. (See https://www.iana.org/domains/root/db/cash.html for the delegation record of ".cash".) The fix is straightforward.