Suppose I have a mailing list, foo-discuss@example.org, and a
public-inbox set up, subscribed to that mailing list, that is subscribed
to that list as public-inbox+foo-discuss@example.org, where my MTA
delivers to public-inbox using public-inbox-mda.

In this case, mail will be To: foo-discuss@example.org, but RCPT TO (and
therefore ORIGINAL_RECIPIENT) public-inbox+foo-discuss@example.org.  In
my testing, public-inbox requires *both* the To: header and
ORIGINAL_RECIPIENT to match publicinbox.<name>.address.

But, public-inbox-config(7) has this to say for
publicinbox.<name>.address:

> The email address of the public-inbox.  May be specified
> more than once for merging multiple mailing lists (or migrating
> to new addresses).

Nothing in this suggests to me that I would need to set it more than
once for my simple use case.

So my question is, am I overcomplicating this -- should I be able to set
a single value for publicinbox.<name>.address that will get my
public-inbox to accept mail from the list?  Or, alternatively, should a
sentence be added to that description explaining that multiple addresses
will also be required for the case where public-inbox is subscribed
itself to a mailing list?