Generic Array in for loop

[Sedas25]

Hello does anyone know how I can get a generic array
in the for loop

---@class ProDS.Language
---@field public key string

---@class ProDS.LanguageArray<T>: { [integer]: T }
---@operator call:fun():string

---@type ProDS.LanguageArray<ProDS.Language>
local ab = {}

---This works fine
local test= ab[1]

---return nil but for the loop i need the __call operator
local fCallReturn = ab()



for cLanguage in cCatalog:Languages() do
  print(cLanguage.key)
end

so that everything fits

[carsakiller]

This would require generic classes, which are not supported yet.

[Sedas25]

Too bad but that's the way it is.
Thanks for your anwser