| thiemowmde added a comment. |
Pywikibot should not assume all QuantityValues can be casted to IEEE numbers. For example, a QuantityValue can be "1000000.00000000054321". Depending on the data types you have in your programming language (if it's single, double or something else) converting this to a number and back to a string will result in something like "1000000.0000000006" or worse:
1000000.00000000054321.toFixed( 40 ) // Output: "1000000.0000000005820766091346740722656250000000"
That should be avoided, obviously. Never cast the elements from a QuantityValue to IEEE numbers when not necessary for actual calculations.
When dealing with user inputs you can (and should) either use wbparsevalue, or come up with your own parser that converts this to a string allowed in a QuantityValue. Again, make sure you are converting "100000000000000054321e-14" to "1000000.00000000054321" without loosing precision.
Cc: thiemowmde, Tobias1984, Aklapper, StudiesWorld, pywikibot-bugs-list, ArthurPSmith, Mdupont, D3r1ck01, Izno, Wikidata-bugs, aude, jayvdb, Ricordisamoa, Mbch331
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