allow updating array/object-based prop type using same array/object

[ngokevin]

Description:

I'd like to be able to update an array property type using the same array without having the clone the object myself to get past the component deepEqual check.

// test component
schema: {
  foo: {type: 'array'}
}

var foo = el.getAttribute('test').foo;
foo.push(50);
el.setAttribute('test', 'foo', foo);

Currently I need to do:

var foo = el.getAttribute('test').foo;
foo.push(50);
el.setAttribute('test', 'foo', AFRAME.utils.clone(foo));

Possible solutions:

// Skip equals check flag or force update flag.
el.setAttribute('test', 'foo', foo, true)

// Options object for setAttribute
el.setAttribute('test', {foo: foo}, {forceUpdate: true, clobber: false});

• Clone the object/array when setting oldData, but this doesn't sound great for perf.

[dmarcos]

@ngokevin Anything we want to still do?

[ngokevin]

Issues still applies. I'd set an internal __dirty flag to arrays (possibly objects) and override Array methods to detect if they are changed. Would allow to skip deep equal checks.