Hi there,

Downstream projects using RLP that try to target ES5 cannot use this library since it's published code is not compiled using Babel.

In the case of 0x, we are unable to minify our webpack bundle using UglifyJs since it only supports ES5. By publishing this library in ES6 syntax rather then compiling it to the lowest denominator, downstream projects are forced to either fork & compile to ES5, or use something else.

Please consider keeping your source code in ES6 syntax, but compiling it to ES5 before publishing the library to NPM.