Mark Classes as final

[colemancda]

Optimizes code to C++, level performance.

Also, in the MySQL class, you would not want that to be subclassed, and the internal pointer should be private.

[iamjono]

Thanks Alsey, I'm bubbling this back up to the surface with the team. Stay tuned :)

[iamjono]

For those coming across this issue via search, Alsey is referring to code optimizations that take advantage of dispatch techniques in the compiler. There's a great article here.