Wrapping in BE/LE for bi-endian creates multiple module wrappers

[XVilka]

If I use more than one structure - it creates more than one wrapper module with the same name. Should be either only one wrapper (not sure if it is possible with ppx though - to "merge" all structures into the one module), or multiple.

[emillon]

It's possible to do that with a ppx, but you'll probably have to do that in two steps: first, compute all the values and the modules they'll go in, and then build and emit an AST.