Function pack

packages/effect/src/internal/hashMap/node.ts:306–325

(
  edit: number,
  count: number,
  removed: number,
  elements: Array<Node<K, V>>
)

}

function pack<K, V>(
  edit: number,
  count: number,
  removed: number,
  elements: Array<Node<K, V>>
) {
  const children = new Array<Node<K, V>>(count - 1)
  let g = 0
  let bitmap = 0
  for (let i = 0, len = elements.length; i < len; ++i) {
    if (i !== removed) {
      const elem = elements[i]
      if (elem && !isEmptyNode(elem)) {
        children[g++] = elem
        bitmap |= 1 << i
      }
    }
  }
  return new IndexedNode(edit, bitmap, children)
}

function expand<K, V>(
  edit: number,