TypeHandler cannot support super classes or interfaces.

[gaohanghbut]

look the code UnknownTypeHandler.resolveTypeHandler.
If a TypeHandler in the TypeHandlerRegistry is mapped by an interface class, the TypeHandlerRegistry.getTypeHandler cannot return the TypeHandler because of the giving type is parameter.getClass，so I think it's useful if TypeHandlerRegistry can return the TypeHandler mapped by interface(if only implemented one) or super classe

[harawata]

It does not seem to be a good idea because it could cause unintentional registration.
As in my comment on #607 , please use @MappedTypes to specify multiple classes.

Anyway, thank you for your idea! =)