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Bug
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    Resolution: Unresolved
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P3: Somewhat important
 - 
    6.8.4, 6.10.0 Beta4
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    None
 
Code
import QtQuick Window { width: 400 height: 300 title: (Number(1) + Number(2)).toString() // Member "toString" not found on type "QJSPrimitiveValue" [missing-property] visible: true }
Notes
qmllint doesn't like the code above, but it is perfectly happy with the following:
- title: Number(3).toString()
 - title: Number(1) + Number(2)