is there any reason why we should not completely drop the type specifier for enum classes?

If I understand right it can sometimes be required if you have an enum class and something else with the same name then using the type specifier gets makes sure that you get the enum. It's a rare corner case but it seems worth keeping.

Therefore, I'd rather have a compiler version check if possible. It's a little tricky to pin down exactly when it was fixed but the internet suggests it was fixed in Visual Studio 2017. Therefore a version check of _MSC_VER >= 1910? We can nail it down tighter if needed later (if we find/receive better info)

I think it's right to base this on MSVC version rather than Python version (we started with Python version because 3.4 requires quite an old compiler)

Thanks