https://bugzilla.wikimedia.org/show_bug.cgi?id=66580

            Bug ID: 66580
           Summary: Better support for exact values in Quantity DataType
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: WikidataRepo
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
       Web browser: ---
   Mobile Platform: ---

Some quantity properties "intrinsically" have exact values - like the number of
people in a parliament, the number of planets in the solar system, etc. It's
confusing to users that Wikibase will guess a margin of uncertainty of +/-1 in
such cases. 

Considering that this guess would be correct for e.g. the number of square
meters in a room, we can't use a general rule for avoiding this problem. We
need some kind of hint to the parser what heuristic to apply for guessing the
uncertainty. That hint could be

a) A per-property flag (possibly represented by a claim) 
b) A separate "amount" or "number" DataType, which would also use
QuantityValue, but would have different parsing rules from the "quantity"
DataType used for measured values.

Note btw that "population" is a natural number count but should *not* default
to exact values, but apply the +/-1 rule.

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