---@diagnostic disable
local LUA_REFNIL = -1 -- lib_aux.c
local FREELIST_REF = 0

local function __ref(value)
  if rawequal(value, nil) then return LUA_REFNIL end
  local ref = __registry[FREELIST_REF]
  if ref ~= nil and ref ~= 0 then
    __registry[FREELIST_REF] = __registry[ref]
  else
    ref = rawlen(__registry) + 1
  end
  __registry[ref] = value
  return ref
end

local function __unref(ref)
  if ref > 0 then
    __registry[ref] = __registry[FREELIST_REF]
    __registry[FREELIST_REF] = ref
  end
end