Checklist

• I have looked into the Readme and Examples, and have not found a suitable solution or answer.
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Description

According to https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.3 the audience claim is OPTIONAL. I'm trying to verify a token without an audience by not providing the audience parameter to this library, but this doesn't appear to be supported.

Reproduction

1. Leave audience undefined
2. Assertion in code checks for defined audience => error

Additional context

No response

express-oauth2-jwt-bearer version

1.6.0

Node.js version

18.18.2