The DeferredComparison for BSONObj uses BSONObj::woCompare
In turn, it compares BSONElements using explicitly BSONElement::woCompare

This misses the opportunity to use the DeferredComparison of BSONElement for overloaded comparison operators.

Although this is a strong constraint in the current implementation, this does not allow to specify a different BSONElement comparison implementaton using the DeferredComparison mechanism that could be used instead.

Potential usage: implicit type conversion