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They're ALWAYS const objects, though they also chock full of relocations so they are never in read-only sections of memory (except maybe in final executables that are position-dependent). These are methods in a private sub-class of QVariant. No one outside of QtCore (at least qtbase) should be using them directly. QVariant doesn't have many friends (a bit anti-social); the one that matters is qvariant_cast and that one does access QVariant::Private. This is not a BC problem because QVariant::Private::type()'s signature is not changing. In any case, QVariant's Q_CORE_EXPORT does not apply to QVariant::Private anyway (see [1]). [1] https://msvc.godbolt.org/z/r9cer8eWh Change-Id: I3859764fed084846bcb0fffd17035355f823dc8f Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io> (cherry picked from commit eb9ace1cee4bb48005797b0b2d2d3d576a4cb4ce) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>