code: func IsNameAttribute(oid asn1.ObjectIdentifier) bool {
  	if len(oid) != 4 {
  		return false
  	}
  	if !nameAttributePrefix.Equal(oid[0:3]) {
  		return false
  	}
  	_, ok := nameAttributeLeaves[oid[3]]
  	return ok
  }
docs: // IsNameAttribute returns true if the given ObjectIdentifier corresponds with
  // the type of any name attribute for PKIX.