ArraySchema: moving items results in wrong state

[pkamilp]

Code to reproduce

import { ArraySchema } from '@colyseus/schema';

const deckCards: ArraySchema<number> = new ArraySchema<number>();

deckCards.push(1);
deckCards.push(2);

deckCards.shift();
deckCards.unshift(3);

deckCards.at(0); // should be 3

[endel]

Thanks for reporting @pkamilp, I can confirm this is a problem. The client-side seems to decode this operation properly (deckCards[0] does contain the value 3), but the server-side has the wrong index.

This is yet another issue that makes me think arrays should be synchronized and treated completely differently than it currently is. Let's leave this issue open until we have a plan of action.