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Diverging from the original topic a bit...

Robert wrote:

> While operators for bit-fields are very useful I think a
> better way is a syntax which allows you describe/build
> the whole bitstring in one go. We have this in Erlang and
> it makes building/pulling apart protocol packets very
> much easier and clearer.


> This really is powerful and simplifies a lot of things
> and I think that something similar would be useful for Lua
> if you seriously intend to work with bitfields.

I agree - something like vstruct [1, 2] could do the job. I have used it for just that, packing/unpacking network protocols.