[Qt5-feedback] Add internalVariant to QModelIndex

[Stephen Kelly]

Stephen Kelly wrote:

>> I understand the issues regarding performance and the current trivial
>> constructor/copy-constructor for QModelIndex, so I can "settle" for an
>> additional int-or-enum value (in addition to the current void* inside
>> the QModelIndex).
> 
> There is
> 
> int QModelIndex::internalId()
> 
> already. Does that help?

I see now that you mean something different. I don't see how your idea of 
something like:

int QModelIndex::internalType() const

would help or make anything easier though.