Casting a functions result not working return f()--[[@as type]]

[Nexela]

Both of these warn on return type miss match

---@param city_name string
---@return string
function parseCityName(city_name)
  local str = city_name:match(".*, .*, (.*)")--[[@as string]]
  return str
end

---@param city_name string
---@return string
function parseCityName(city_name)
  return city_name:match(".*, .*, (.*)")--[[@as string]]
end

This works correctly but loses the compactness

---@param city_name string
---@return string
function parseCityName(city_name)
  local str = city_name:match(".*, .*, (.*)")
  return str--[[@as string]]
end