sure, thank you. I will go through the PR review process for asn1 and x509, 
maybe some good ideas will come up. 
Sebastien 

On Friday, June 26, 2020 at 11:51:05 AM UTC-7, Ian Lance Taylor wrote:
>
> On Fri, Jun 26, 2020 at 11:03 AM Sebastien Rosset <sro...@gmail.com 
> <javascript:>> wrote: 
> > 
> > @ianlancetaylor , thank you for the quick reply. The reason I was asking 
> is because potentially this could have been used to fix `type 
> ObjectIdentifier []int` in the `encoding/asn1` package and the 
> `crypto/x509` package. Currently these package are not fully compliant with 
> the ASN.1 specification, which means in practice some certificates cannot 
> be parsed. 
> > 
> > 
> > I am trying to fix the encoding/asn1 and crypto/x509 package by adding 
> support for OID values that are greater than 2^31. There are multiple ways 
> to fix the issues, and unfortunately it won't be possible to simply change 
> the ObjectIdentifier type because that would break too many applications. 
> If it's not possible to change the type, then most alternatives seem to be 
> somewhat cumbersome. For reference the PR is 
> https://github.com/golang/go/pull/39795. 
>
> Thanks, understood. 
>
> Generics don't solve all problems.  I agree that there seems to be a 
> way that we could modify generics to solve this particular problem. 
> But it means introducing an idea that the rest of the language has 
> decided to reject: default values for arguments.  I don't think it 
> would be consistent with the language to permit default values for 
> type arguments when we do not permit default values for non-type 
> arguments.  While we don't have to be strictly consistent here, I 
> think we need a good reason to break consistency.  And in the larger 
> scheme of things I don't think that making it easier to make a 
> backward compatible change to one specific package, a package that is 
> not all that widely used, is a good enough reason. 
>
> I'm not claiming to have the final word, but that is my opinion. 
>
> Ian 
>

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