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     Technical task Technical task
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    Resolution: Unresolved
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    P2: Important 
When using built-in JavaScript functions with arguments (e.g. "toFixed()", "isNan()", ...) then then qmlint shows an efficient code generation warning:
property real n: 10.2123
Text {
 text: n.toFixed(1).toString()
}
:-1: error: MWBigNumberDoubleInputField.qml:3:10: Could not compile binding for text: Cannot generate efficient code for call to untyped JavaScript function