get value from proxy

[mun24]

Unable to get value from proxy, for example:
result = vm.run("let i={y: new Date()};i");

result = Proxy {y: }
[[Handler]] = Object
[[Target]] = Object
y = Thu Oct 11 2018 12:01:40 GMT-0400 (Eastern Daylight Time) {}
proto = Object {constructor: ,defineGetter: ,defineSetter: ,hasOwnProperty: ,lookupGetter: ,...}
[[IsRevoked]] = false
How to get new Date() value. result.y is proxy.

[gr0uch]

Duplicate of #62