`mutJson` can't be mutated

[tsuf239]

I tried this:

let a: MutJson = {a: 1, b: 0};
let b = MutJson {a: 1, b: 0};

a.delete("a");
b.delete("a");

This happened:

I expected this:

to work

Is there a workaround?

No response

Anything else?

No response

Wing Version

0.82.1

Node.js Version

No response

Platform(s)

No response

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