https://bugzilla.wikimedia.org/show_bug.cgi?id=71956

            Bug ID: 71956
           Summary: Parsing errors around year 0
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: Unprioritized
         Component: WikidataClient
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
       Web browser: ---
   Mobile Platform: ---

Year 0 is a bit of an odd beast, see https://en.wikipedia.org/wiki/0_%28year%29

The parsing seems to go wrong in different cases:
* 0 with precision year gives 0
* 0 with precision decade or larger gives +00000000000-01-01T00:00:00Z
* 1+ with precision year works
* 1-4 with precision decade gives +00000000004-01-01T00:00:00Z
* 1-49 with precision century gives +00000000049-01-01T00:00:00Z
* 1-499 with precision millenium gives +00000000499-01-01T00:00:00Z
* etc

See https://www.wikidata.org/wiki/Q5959 for an example. It's impossible to add
the birth date now without causing a parse error on Wikipedia.

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