Right shift operator not supported for target 5.4 #1720

Although the tsconfig target is 5.4, I still face the following error:

Right shift operator is not supported for target Lua 5.3. Use >>> instead.

  "tstl": {
    "luaLibImport": "require-minimal",
    "luaBundle": "./dist/server.lua",
    "luaBundleEntry": "./src-ts/index.ts",
    "luaTarget": "5.4",
    "noImplicitSelf": true,
    "sourceMapTraceback": false
  }

Playground: https://typescripttolua.github.io/play#code/5.4/A4JwlgdgLgFAbAAgHxIQJgJRA

Note: LuaJIT works, but I still need LuaFloorDivision, which don't work on JIT, so I can't just change to it.