Composing validations stopped working in Ember 3.10

[mydea]

Environment

• Ember Version: 3.10
• Ember CLI Version: 3.8.0
• Ember CP Validations Version: 4.0.0-beta.9

Steps to Reproduce

Before I updated to ember-source 3.10 (and to make it work, ember-cp-validations 4.0.0-beta.9), we had code like this that worked fine:

const Validations = buildValidations(
  {
    ...
  }
);

export const SharedValidations = buildValidations(
  {
    ...
  }
);

export default Model.extend(Validations, SharedValidations, { });

After upgrading, this stopped working. I ended up just manually merging the validations and repeating the declarations, but wanted to let you know that this happened - it's also not really well documented, so not sure if that was even supposed to work (although it was a quite handy feature...!).