Missing Signature.signed property

We can verify when a signer signed all the documents as follow:

documentPackage.getDocuments().stream()
   .flatMap(d -> d.getSignatures().stream())
   .filter(s -> Objects.equals(s.getSignerEmail(), signer.getEmail()))
   .allMatch(s -> s.getAccepted() != null);

Our issue is that this is not true if the signer did not confirmed the transaction at the end of the last signed document. Analysing the data, we found out that this would work:

documentPackage.getDocuments().stream()
   .flatMap(d -> d.getSignatures().stream())
   .filter(s -> Objects.equals(s.getSignerEmail(), signer.getEmail()))
   .allMatch(s -> s.getAccepted() != null && s.getSigned() != null);

With the SDK (v11.56 and below), the class Signature does not reference the signed property. By adding this property and setting it within the method SignatureConverter#toSDKSignature() like this would resolve our issue:

Signature signature = signatureBuilder.build();
if (null != apiApproval.getAccepted())
    signature.setAccepted(apiApproval.getAccepted());
if (null != apiApproval.getSigned())
    signature.setSigned(apiApproval.getSigned());
 

So, what is the best way to request this fix within the SDK? Do we fix it ourself in a branch and asking for a pull request? If so, is it better to branch from the master or the dev branch?