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function prototypeChain(global) {
let result = [];
while (global !== null) {
let thrown = false;
let next = Object.getPrototypeOf(global);
try {
Object.setPrototypeOf(global, {});
result.push('mutable');
} catch (e) {
result.push('immutable');
}
global = next;
}
return result;
}
self.onmessage = function(e) {
e.data.postMessage(prototypeChain(self));
};