Object and partial ES5 support

In Espruino Pico 1v76 I've noticed that Object.getOwnPropertyDescriptor is present, and returns a descriptor object, but everything else available in ES5 to actually define properties through descriptors is missing:

Object.defineProperty;
Object.defineProperties;
Object.create(null, {test: {get: function () {return 123}}}).test;
Object.create(null, {test: {value: 456}}).test;

All these are undefined and I wonder why, at this point, Object.getOwnPropertyDescriptor is available. It kinda misleads features detection.

As summary: is there any plan to bring the ability to define properties through descriptors, or, if not, could we just drop getOwnPropertyDescriptor so no code would be confused about its presence?

Thanks!