Jc3s5h added a comment.

Exact numbers can occur not only through counting, but also through definition. 
For example, as explained by the US National Geodetic Survey 
<http://www.ngs.noaa.gov/PUBS_LIB/FedRegister/FRdoc59-5442.pdf>, one yard is 
defined as exactly 0.914 4 meter. One could imagine properties in Wikidata 
where most of the instances are measured, and have an associated uncertainty, 
but a few instances are defined, and so are exact. So unless it can be proven 
that a certain property is //always// uncertain, or //always// exact, the 
property should be designed to accept either the proposed number type, or 
QuantityValue.

If it isn't possible or practical to make properties take either kind of 
number, I don't see any choice but to use QuantityValue with amount = 
lowerBound = upperBound.


TASK DETAIL
  https://phabricator.wikimedia.org/T112247

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To: Jc3s5h
Cc: daniel, Lydia_Pintscher, Liuxinyu970226, Snaterlicious, jayvdb, SPQRobin, 
Wikidata-bugs, DSGalaktos, Bugreporter, geraki, Ayack, Gareth, kaldari, 
Smalyshev, Izno, AmaryllisGardener, Sjoerddebruin, Mbch331, Stryn, Denny, 
Jc3s5h, Aklapper, aude



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