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>  [...]
> and apparently only lpeg.Cf() distinguishes all these cases... I
> couldn't find anything else, besides lpeg.Cf(), that would _not_
> coerce the three cases above into five or six separate captures.
> Are there other ways - besides lpeg.Cf() - to access the captures
> while they are still in this form,
>   "a" ("b" "c") ("d" "e")
> or
>   ("a" "b") ("c" "d") ("e" "f"),
> before the groups are unpacked?

Not that I know. How that could happen? LPeg groups have no
representation as Lua values. You still want to give them meanings they
don't have.

-- Roberto