bad type narrowing not removing nil

[lewis6991]

    local text --- @type string[]?
    if staged then
      local text1 --- @type string[]?
      text = text1
    else
      local text2 --- @type string[]?
      text = text2
    end

    if not text then
      return
    end

    --- @param _a string[]
    local function foo(_a) end

    foo(text)

[lewis6991]

Another case:

[lewis6991]

Another case:

[lewis6991]

Another case: