Modifying state in Luau, does not behave as expected

[Scharps]

I'm using the sandbox function to use Luau but it results in a different outcome to the non-sandboxed Lua.

I have a loop where the state global variable is set, Lua is executed, and state extracted back out for the next iteration.

for _ in 0..10 {
    lua.globals().set("state", state)?;

    lua.load(
        r#"
        if state.i == nil then
            state.i = 0
        end
        print("Before incrementing: ", state.i)
        state.i = state.i + 1
        print("After incrementing: ", state.i)
        print("")
        "#,
    )
    .exec()?;

    state = PersistedState::from_lua(lua.globals().get("state")?, &lua)?;
}

Without sandbox(true) this executes as expected:

Before incrementing:    0
After incrementing:     1

Before incrementing:    1
After incrementing:     2

Before incrementing:    2
After incrementing:     3

Before incrementing:    3
After incrementing:     4

Before incrementing:    4
After incrementing:     5

But with, it outputs the following:

Before incrementing:    0
After incrementing:     1

Before incrementing:    1
After incrementing:     1

Before incrementing:    2
After incrementing:     2

Before incrementing:    3
After incrementing:     3

Before incrementing:    4
After incrementing:     4

Are there any differences between Lua and Luau that would cause this or is it an error in implementation?

[khvzak]

Hard to say without full example. Do you have code that I can run to reproduce?

[Scharps]

Here is a branch with just the state logic https://github.com/Scharps/paint/tree/sandbox

[khvzak]

Reported in luau-lang/luau#1535