Can not set prototype properties in IE10

[madmed88]

Since IE10 does not support setPrototypeOf, prototype properties are copied and arenot writable.
As a workaround I changed
Object.defineProperty(proxy, k, {get: getter.bind(target, k)});
to
Object.defineProperty(proxy, k, {get: getter.bind(target, k)}, set: setter.bind(target, k));

any reason why you don't allow setting prototype properties?

[samthor]

This bug is nearly four years old. I don't have a practical way of testing on IE10.

If this is important to anyone, please send us a PR :)