`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

从 .luarc.json 配置和最小的 lspconfig.lua_ls.setup({}) 入口开始，然后跟踪 runtime.version 的加载方式，并将其与正常工作的 diagnostics 设置进行比较。在使用 LuaJIT 的 Neovim 中复现补全或跳转到定义；当标准库定义使用 Lua 5.1 而不是 Lua 5.4 时，即可认为问题已解决。