Paul Wouters via dev-security-policy <dev-security-policy@lists.mozilla.org> 
writes:

>I'm not sure how that is helpful for those crypto libraries who mistakenly
>believe a certificate is a TLS certificate and thus if the EKU is not empty
>it should have serverAuth or clientAuth.

Sure, it wouldn't help with current libraries that neither acknowledge non-TLS
use nor know about the tlsCompabitility EKU, but it would act as a signalling
mechanism going forward to inform RP's about what's going on.  So if you get
notified about an apparently-wrong cert you can see the tlsCompabitility EKU
and realise what's going on.

Peter.
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