docs: private static Chainr getChainr( ChainrInstantiator chainrInstantiator, Object chainrSpec ) {
          Chainr chainr;
          if (chainrInstantiator == null ) {
              chainr = Chainr.fromSpec( chainrSpec );
          }
          else {
              chainr = Chainr.fromSpec( chainrSpec, chainrInstantiator );
          }
          return chainr;
      }