The heap is not expanded when its max size is reached

[pieter-v]

The heap uses a TypedArray as its data buffer.

this.heap = new Uint16Array(0x100000);

If something is pushed on the heap, then there is no size checking:

push(item: number): void {
    this.heap[this.offset++] = item;
}

A TypedArray doesn't expand its buffer when the maximum size is reached and it doesn't throws an error when you write outside its buffer.

This probably causes the error reported in emberjs/ember.js#16503

[rwjblue]

Thank you for reporting @pieter-v!