Echo JS 0.11.0

Note that under the hood the engine uses a more diverse range of types which are swapped in and out as necessary (at least in the case of V8):

https://uploads.disquscdn.com/images/acfab1be378bd89f96cab0b894e1ad7ee3cba7f98fa8ff19c96bd3e3027cb10e.png 

from https://v8docs.nodesource.com/node-7.4/inherits.html