-1 to adding a method here, as commented in the other commit:

> Please do not make EquivalentConcurrentHashMapV8 implement anything extra. We're trying to keep that as a specialised version of CHMv8, hence once in a while we need to backport fixes. The more stuff it's added to it, the more difficult it becomes to maintain. The Equivalent stuff was added cos there was no other choice. Alternatively, do the opposite, create a new map that contains a reference to EquivalentConcurrentHashMapV8, or extends it.

Vladimir:
> I agree with you in principle @galderz but alternatives are also ugly. This is one method extra added at the bottom of the file.

@vblagoje What about extending EquivalentConcurrentHashMapV8? What other alternatives did you consider and why did you consider them ugly?