Decide which optimizations are worth having

[emanjon]

• I removed the optimization to skip the outer array in subject and issuer.

• "If subjectAltName contains exactly one dNSName, the array and the int are omitted and extensionValue is the dNSName encoded as a CBOR text string." This saves 2 byte

• The EUI-64 optimization saves 17 bytes and should definitly be kept.

• The optimization for keyusage saves 2 bytes.

• The optimization for the special case utf8string common name saves 3 bytes.

[highlunder]

I'd vote to ditch the subjectAltName optimization (and the first which you already removed) and keep the rest.

[highlunder]

Conclusion for now is to keep the remaining optimizations.