This is a fork of golang/x/crypto with added support for fetching ACME alternative certificate chains by Maartje Eyskens.
This was historically used by cert-manager to allow our users to specify a preferred chain to be fetched i.e from Let's Encrypt.
Since cert-manager v1.4 this fork is no longer used as support for fetching alternate chains was added in upstream go/crypto (CL (#2777294).
This repo remains here so as to not break anyone importing older versions of cert-manager