My notes inform me that my intent was for QSpan::extent to be size_t, for compatibility with both its template argument and std::span::extent. So fix it to be size_t instead of qsizetype. While extents that go beyond numeric_limits<qsizetype>::max() will be unusable in practice, QSpan doesn't actually allocate memory, so declaring one should be possible, if only for compatibility with std::span, without getting into a situation where E != extent. Pick-to: 6.6 Change-Id: Ic8ae3a1c03801b4a23b7ba56388372cac64f9e5e Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io> Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>