Is Reflect.set working as intended?

[jfparadis]

@tvcutsem, would you have a reference on the rationale for the behavior of Reflect.set? I can understand the specs, but it's nonetheless surprising. Thanks in advance!

Reflect.set is quite intuitive.

g = { foo: 'A' }; e = { foo: 'B' }; 
console.log(Reflect.get(e, 'foo', g)); // 'B' <= as we expect, value came from "e"

However, Reflect.set is surprising.

Reflect.set(e, 'foo', 'X', g); 
console.log(g.foo, e.foo) // 'X', 'B' <= surprise, data property was set on "g"

This also seems to confuse others:

I guess it's just confusing that Reflect.get reads from the target, while Reflect.set writes to the receiver.

https://stackoverflow.com/questions/47992070/reflect-set-not-working-as-intended