`runtime.version` isn't applied from `.luarc.json`

How are you using the lua-language-server?

NeoVim

Which OS are you using?

Linux

What is the issue affecting?

Completion

Expected Behaviour

It should look up definitions for LuaJIT (Lua 5.1).

Actual Behaviour

It looks up definitions for Lua 5.4.

Reproduction steps

1. Having the following .luarc.json in a project:

{
  "$schema": "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json",
  "diagnostics": {
    "globals": [ "after_each", "before_each", "describe", "it", "vim" ],
    "disable": [ "redefined-local" ]
  },
  "runtime": {
    "version": "LuaJIT"
  },
  "workspace": {
    "library": [
      "$VIMRUNTIME"
    ],
    "checkThirdParty": false
  }
}

2. Open Neovim and edit a .lua file
3. Go to definition for any standard library function
4. Notice the version of the standard library used

Additional Notes

I'm using Neovim v0.10.1 with the native LSP.

I can reproduce this with a very simple config (no settings):

    lspconfig.lua_ls.setup({})

One important thing to mention is that other settings like diagnostics are properly applied.

Log File

file_home_ignacio_devel_projects_plantuml.nvim.log

從 .luarc.json 設定和最小的 lspconfig.lua_ls.setup({}) 進入點開始，接著追蹤 runtime.version 的載入方式，並與正常運作的 diagnostics 設定比較。在使用 LuaJIT 的 Neovim 中重現補全或跳至定義；當標準函式庫定義使用 Lua 5.1 而不是 Lua 5.4 時，即可視為問題已解決。