When looking up the object only support own props

[alexewerlof]

Changing this behavior will break looking up properties from objects that are instantiated from classes:

class A { get z() { return 2}}
const b = new A
b.z // 2
b.hasOwnProperty('z') // false

Dealing with the __proto__ pollution vulnerability is outside the scope of this lib:

f = { foo: 'f' }
g = {__proto__: f, bar: 'g'}
g.foo // "f"
g.bar // "g"
g.__proto__ = { cux: 'c' }
g.cux // "c"
g.foo // undefined