__gc is ignored for tables, isn't it?

[Sam Roberts <sroberts@...>]

My experiments and reading of the ref manual indicate this, but I want
to confirm. LuaObjectiveC seems to assume __gc will be called when
putinto a table's metadata.

Also, for the purposes of garbage collection in weak tables, these are
"values" and will never be gced:

  number
  string
  boolean

and these are "objects" and will be removed from weak tables when
no strong references remain:

  function
  userdata (light and full)
  thread
  table

and nil can't be a key or value in tables.

Do I have this right?

Sam