nyanpasu64/immerjs aliasing bug.html

## immerjs aliasing bug.html
<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="ie=edge" />
		<title>Test in Browser</title>
		<script src="https://cdn.jsdelivr.net/npm/object-assign-polyfill@0.1.0/index.min.js"></script>
		<script src="./dist/immer.umd.js"></script>
	</head>
	<body>
		<script>
			try {
				let orig = [[0]];
				orig.push(orig[0]);

				// 0,0
				// Why not console.log(orig) directly? Mutating orig at the end of this code alters logs from earlier on!
				console.log(orig + "");

				function try_it(fn) {
					const result = immer.produce(orig, fn)
					console.log(result + "")
				}

				// 1,0
				try_it(function(draft) {
					draft[0][0] = 1;
				});

				// 1,1
				try_it(function(draft) {
					draft[1] = draft[0];
					draft[0][0] = 1;
				});

				// 1,1
				orig[0][0] = 1;
				console.log(orig + "");

			} catch (err) {
				alert(err)
			}
		</script>
	</body>
</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8" />
	<meta http-equiv="X-UA-Compatible" content="ie=edge" />
	<title>Test in Browser</title>
	<script src="https://cdn.jsdelivr.net/npm/object-assign-polyfill@0.1.0/index.min.js"></script>
	<script src="./dist/immer.umd.js"></script>
	</head>
	<body>
	<script>
	try {
	let orig = [[0]];
	orig.push(orig[0]);

	// 0,0
	// Why not console.log(orig) directly? Mutating orig at the end of this code alters logs from earlier on!
	console.log(orig + "");

	function try_it(fn) {
	const result = immer.produce(orig, fn)
	console.log(result + "")
	}

	// 1,0
	try_it(function(draft) {
	draft[0][0] = 1;
	});

	// 1,1
	try_it(function(draft) {
	draft[1] = draft[0];
	draft[0][0] = 1;
	});

	// 1,1
	orig[0][0] = 1;
	console.log(orig + "");

	} catch (err) {
	alert(err)
	}
	</script>
	</body>
	</html>