It seems that many of the member-methods are documented as returning `Boolean` values, which is what the build-in functions return. However, in action, member-methods actually (often times) return the host object.
For example, `array.append()` is documented as returning a `Boolean`:
... but, returns the host Array.
I outlined the methods I tested over here:
I'd be happy to submit PRs for the documentation if someone could point me to where / how that is done.