While fixing QTBUG-116076, I found out that the qHash() adapter matches not only qfloat16, but also all concrete pointer types. Deprecating it, I get warnings for, among other things:

• QPersistentModelIndexData *
• QThreadPoolThread *
• unsigned char *
• Unknown macro: {[QAbstractAnimation *}

  }

• bool
• QObject *
• QLoggingCategory *

The problem is that we can't change the hash calculation, as the function is inline. So the following solutions don't apply:

• constrain the adapter further, to include !is_pointer_v<T> and !is_integral_v<T>, because that would make it use qHash(const T*, size_t), which doesn't xor in seed.
• add a qHash(T*, size_t), hopefully a better match for pointer-to-non-const objects, but that would mean we need to be consistent with both existing qHash(const T*, size_t) as well as the adapter, and they're not consistent with each other

For the time being, it seems we can't do better than to wait this out for Qt 7?