Lune’s file execution resolution allows .lua to run .luau files

[amirfarzamnia]

Description:

When executing a script with lune run, Lune correctly supports running a main.luau file through any of the following:

lune run main
lune run main.luau
lune run ./main
lune run ./main.luau

However, it also (incorrectly) runs the same main.luau file when the .lua extension is used:

lune run main.lua
lune run ./main.lua

This means that specifying a .lua file implicitly resolves to a .luau file, which is unexpected and not supported in the luau-lsp extension either. This looks like an architectural issue in how script resolution is being handled, since .lua shouldn’t map to .luau automatically.

Expected behavior:
.lua should not execute a .luau file unless explicitly supported and documented.