It seems clear that there are no implementations today that support the
"oth" element, i.e., that support RSA with a modulus with multiple
factors.  At least some of them simply ignore the "oth" element, which
unfortunately leads to incorrect operation.  I would propose something of
the following form in JWA:

"""
If the consumer of a JWK does not support multi-prime RSA moduli and it
encounters a private key that includes the "oth" parameter, then it MUST
reject the key.
"""
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