1. There are not standard-conform X509 certificates, but such certificates are 
usually not allowed in the public areas (e.g. CA/Browser Forum). If exists, 
only ignorable percent. 
2. For the not standard-conform fields issuer, subject, and extensions, the 
CBOR-compressed version uses the DER-encoded bytes  so that it can still be 
converted back.

> On 8. Oct 2025, at 23:19, Phillip Hallam-Baker <[email protected]> wrote:
> 
> It is a feature that is going to impose a very high burden on developers, is 
> unlikely to work because of issues that are outside their control (i.e. 
> X.509v3 certs not necessarily using correct DER) and is going to prevent the 
> wider effort taking advantage of the opportunity to break backwards 
> compatibility and jettison some of the X.500 legacy.

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