Using `_ENV` to overwrite a scope

[bczsalba]

Is there any way to use _ENV with Lupa? From my testing I've gathered that each call to either .execute or .eval resets/uses its own _ENV, so if you set it in one call it resets by the next.

Reproduction

from lupa import LuaRuntime

lua = LuaRuntime()

code = """
    hidden = 1
    print(hidden)
    
    _ENV = { print = print }
    
    print(hidden)
"""

for line in code.splitlines():
    lua.exec(line)

The Lua code outputs 1 then nil (like on this compiler), but using Lupa results in 1 and 1.

Context

I'm using Lupa to embed Lua into a UI library I'm making. Each widget has its own script, and their _ENV-s create a sort of cascade where each widget within a container has access to things defined above it, but not to its siblings. The end goal is something like Alpine.js.

I suspect the same cascade would be possible using functions instead of inline do ... end scopes, but that massively complicates everything.

Cheers, and enjoy the holidays!