Bitwise operations with different lengths

[Imberflur]

These operations:

    impl_operation!(and, and_cloned, and_inplace, &);
    impl_operation!(or, or_cloned, or_inplace, |);
    impl_operation!(xor, xor_cloned, xor_inplace, ^);

all assert that the number of bits is the same on both sides:

assert_eq!(self.nbits, other.nbits);

However, for my use case (specifically using or_inplace) the number of bits may sometimes be different so it would be useful to have a set of operations that doesn't make this assertion. Afaict there is also no interface for the user to iterate the storage elements and perform this operation manually.

Additionally, it would be useful to document this panic in the function docs for each of these existing methods.