Contract keys in future release of 3.x.x

As described in the docs,

Contract keys are not supported in this release of Canton 3.x. Support for non-unique contract keys will come in a future release of Canton 3.x.

So is there the concept somewhwere described or able to use? What’s the version the unique contract keys will be supported in?

@Lukasz2891, in the past, announcements about proposed features have been made at Digital Asset Daml Release Notes. Once such an announcement is made, I’ll try to remember to update this thread too.