Can we have support for array elements that are not primitive types?

I would like to compare arrays whose elements are of type BN or other structured types.

E.g. expect (idArray).to.be.containingAllOf ([new BN (0), new BN (1)]);

This "should" pass but currently returns:
  AssertionError: expected [ <BN: 0>, <BN: 1> ] to be containing all of [0,1]
