We want to be accessible to qmllint and other QML tooling. To this end, make all legal invocations of its methods properly typed invokables. Keep two QQmlV4Function overloads to produce error messages if the methods are called with the wrong parameters. We have to do this because JavaScript is more liberal in its argument coercion than the methods would like. Un-deprecate QJSNumberCoercion::isInteger() since it's actually quite practical here. Pick-to: 6.7 Fixes: QTBUG-112366 Change-Id: I016e5edc47efaade44461c504c1b3e2b1b829b58 Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io> Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Ulf Hermann <ulf.hermann@qt.io> Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>