Casting an otherwise unused variable in a block preserves the cast outside of block

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Windows

What is the issue affecting?

Type Checking

Expected Behaviour

Any casts inside a block should not be maintained once leaving that block.

Actual Behaviour

Type cast is maintained even after the block in which the variable was cast if and only if the variable was not used in that block.

Reproduction steps

This is incorrect:

---@type number|string
local i
if true then --can be `false` or any other logical
  ---@cast i number
  local _ = 0 --not referencing variable `i` that was cast above
end
local j = i --type of j is `number`, should be `number|string`

This is correct:

---@type number|string
local i
if true then --can be `false` or any other logical
  ---@cast i number
  local _ = i -- referencing variable `i` that was cast above
end
local j = i --type of j is `number|string`

Additional Notes

No response

Log File

No response

Visual Studio Code 拡張機能を通して両方の Lua スニペットを再現し、ブロックの後の j の推論型を比較します。cast 変数が未使用の場合の @cast の処理について、型チェックの経路を追跡し、その後、ブロック内の参照ケースは正しいままである一方で、cast がブロックの外に持ち越されないことを確認します。