Casts on handles

Most leaf handle types (ConstantObject and NonConstantObject and it’s children) have cast overloads associated with them which do the convenience behavior of cast(handle.value). This works for int, str, and float on objects that support them. What’s missing is bool, it was assumed because the previous worked, that a bool cast on a VHDL Boolean object would as well. Instead it uses the default behavior for bool on a value which means it always evaluates to True.

I don’t think we should add __bool__, but instead remove the other interfaces to maintain consistency. The actual operation it offers is trivial. Forcing the users to use handle.value instead makes reading and writing to handles more obvious when reviewing source code.

[ktbarrett]

#1510 fixes the issue from the last comment. Willrevisit this.

[ktbarrett]

With that solution, cocotb would complain always in the first case, even though that usage is technically correct. The warning could mention “use if handle is not None:”, but with any solution someone has to change their code to not get an earful.