Fix: Avoid array destructuring in observer serializer due to Bun/JSC bug

[americanjeff]

Problem

The observer serializer uses array destructuring which can trigger a bug in Bun's JavaScriptCore engine under certain conditions.

In ObserverSerializer.ts, the code:

const [entityId, type, componentId, targetId, relationData] = queue[i]

Can fail with TypeError: undefined is not a function due to a Bun/JSC bug related to Symbol.iterator and typed arrays.

Bug References

• Avoid array destructuring in observer serializer due to Bun/JSC bug #210
• Overriding Array.prototype[Symbol.iterator] with typed array logic causes RangeError in Bun oven-sh/bun#20345 - Overriding Array.prototype[Symbol.iterator] causes RangeError in Bun
• Bun throws RangeError on destructuring with overridden Array.prototype[Symbol.iterator] oven-sh/bun#20515 - Bun throws RangeError on destructuring with overridden Array.prototype[Symbol.iterator]

Solution

Use explicit array indexing instead of destructuring:

const entry = queue[i]
const entityId = entry[0]
const type = entry[1]
const componentId = entry[2]
const targetId = entry[3]
const relationData = entry[4]

Testing

This fix has been tested in a game project that was experiencing crashes after many turns. After applying this fix, the crashes no longer occur.