end
function starts_with(s, prefix)
  if #s < #prefix then
    return false
  end
  for i=1,#prefix do
    if s:sub(i,i) ~= prefix:sub(i,i) then
      return false
    end
  end
  return true

    if k ~= 'parent' then

    -- Most keys in the manifest are definitions. If we need to store any
    -- metadata we'll do it in keys starting with a specific prefix.
    if not starts_with(k, 'fw_') then

PARENT = 'fw_parent'

    Live.manifest.parent = Live.head

    Live.manifest[PARENT] = Live.head

    Live.manifest.parent = Live.head

    Live.manifest[PARENT] = Live.head

      Live.head = Live.manifest.parent

      Live.head = Live.manifest[PARENT]

{"parent":0,"on":1}

{"fw_parent":0,"on":1}