Captured arguments are changed by object changes

[namse]

I found that captured action(or method)'s arguments are changed when I change the object that I passed as argument.

for example,

class A {
  foo(b) {
  }
}

const mockedA = mock(A);
const instanceA = instance(mockedA);
const argument = {};
instanceA.foo(argument);
argument.c = 5;
const [firstArg] = capture(mockedFoo.foo).last();
console.log(firstArg) // print { c: 5 } ! I expected it prints { } because I pass {}.

I guess captured argument should be serialized

[NagRock]

But what then if you would like to compare instances?