Format: add support for some missing constructors

[Kikobeats]

These constructors are missing right now:

expect(format(new Map([['foo', 'bar']]))).toBe("Map(1) { 'foo' => 'bar' }")
expect(format(new Set([['foo', 'bar']]))).toBe("Set(1) { [ 'foo', 'bar' ] }")
expect(format(new Uint8Array([1, 2, 3]))).toBe("Uint8Array(3) [ 1, 2, 3 ]")