You can clone with
It is impossible to use some adapters because it requires Zend\Validator package. For example see Memcached Adapter.
We don't necessarily want to install all the dependencies, as many are optional based on the adapter used. That said, we need to at least mark them as "suggested". I'll add in as many as I can find before the 2.0.3 release this week.
@weierophinney thank you :) it will be nice.
@weierophinney, @tyomo4ka The dependency of Zend/Validatator will be removed from memcached adapter in #2770
#2770 is merged, resolving this issue.