Thanks! I hope Doppio can become useful to many more people. :)<p>There is a proposal for value types [0] that Niko Matsakis [1] and Brendan Eich [2] talked about a couple of years back and could be used to implement 64-bit numbers in JS, but I&#x27;m still waiting for an implementation or a more complete proposal. Looks like it might be dead in the water, as the proposal hasn&#x27;t been edited in quite some time, but I do not have my finger on the pulse of browser standards so I could be wrong.<p>[0] <a href="http:&#x2F;&#x2F;wiki.ecmascript.org&#x2F;doku.php?id=strawman:value_objects" rel="nofollow">http:&#x2F;&#x2F;wiki.ecmascript.org&#x2F;doku.php?id=strawman:value_object...</a><p>[1] <a href="http:&#x2F;&#x2F;smallcultfollowing.com&#x2F;babysteps&#x2F;blog&#x2F;2014&#x2F;04&#x2F;01&#x2F;value-types-in-javascript&#x2F;" rel="nofollow">http:&#x2F;&#x2F;smallcultfollowing.com&#x2F;babysteps&#x2F;blog&#x2F;2014&#x2F;04&#x2F;01&#x2F;valu...</a><p>[2] <a href="http:&#x2F;&#x2F;www.slideshare.net&#x2F;BrendanEich&#x2F;value-objects" rel="nofollow">http:&#x2F;&#x2F;www.slideshare.net&#x2F;BrendanEich&#x2F;value-objects</a>