Odd server_name directive behavior

[CJ Ess]

I have an nginx 1.9.0 deploy and I noticed a working config where the name
given to the server_name directive doesn't match the names in the Host
headers or the certificate DNs. It looks like a mistake, but it works, and
I don't know why! Is it possible that if there is only one server stanza
that nginx doesn't bother comparing the name and just processes the request
via the only stanza defined?
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