V4 Crashes when using Reflect.ownKeys(...)

Just call:
Reflect.ownKeys(Math)

That's cheeky but its not the only "special" object.  For example if you are just trying to figure out the "keys" for Math you can just do:
Object.keys(Math)

as that returns []
But the same is true for:
Object.keys(console)

[]

But you can use:

Reflect.ownKeys(console)
[debug,log,info,...]

So Reflect "can" work for special objects
{{}}

But in the case of:
Reflect.ownKeys(Math)

Qt will Assert in debug mode and crash will a nullptr dereference otherwise.