WowAce

Using a multiselect option and using a table as key for a value in the values parameter gives an error. (Tested on TBC Classic)

Example:

options.example = {
   type = "multiselect",
   name = L["Example"],
   values = function()
      local values = {}
      values[{ type = "foo", subtype = "bar" }] = "foo/bar"
      values[{ type = "foo", subtype = "baz" }] = "foo/baz"
      return values
   end,
   get = function(info, key) return fetch(key.type, key.subtype) end,
   set = function(info, key, value) doSomethingWith(key.type, key.subtype, value) end
}

Exception:
[string "@Masque\Libs\AceConfig-3.0-3\AceConfigDialog-3.0\AceConfigDialog-3.0-81.lua"]:1311: in function <...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1121>
[string "@Masque\Libs\AceConfig-3.0-3\AceConfigDialog-3.0\AceConfigDialog-3.0-81.lua"]:1652: in function `FeedGroup'
[string "@Masque\Libs\AceConfig-3.0-3\AceConfigDialog-3.0\AceConfigDialog-3.0-81.lua"]:1577: in function <...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1561>