//test_run
function deepcopy(orig)
    local orig_type = type(orig)
    local copy
    if orig_type == 'table' then
        copy = {}
        for orig_key, orig_value in next, orig, nil do
            copy[deepcopy(orig_key)] = deepcopy(orig_value)
        end
        setmetatable(copy, deepcopy(getmetatable(orig)))
    else -- number, string, boolean, etc
        copy = orig
    end
    return copy
end

local myOs = deepcopy(os)
os.pullEvent = os.pullEventRaw
print(os.pullEvent == os.pullEventRaw)
os.run({os = myOs}, "test_child")
os = myOs

//test_child
print(os.pullEventRaw == os.pullEvent)