The Ace3 vanilla version is under development so there will probably be no more updates for the old Ace2 version

In vanilla the variable arguments generate extra table so in Ace2 we see many function like

function foo(...<fixed args>..., a1, a2, a3, ..., a20)

to avoid extra table creating cost, but the PC today are much more powerful so I dont think it will be a big issue, sometimes we can reuse the table by rewriting the recursive functions:

function _foo(param, arg)
    ...
    _foo([param, arg)
    ...

function foo(param, ...)
    ...
    _foo(param, arg)  -- arg is the variable argument table
    ...

The iterator must be declared again as local if it will be passed as an argument in the recursive function

function recur(.....)
    for k, v in ....
        local v = v
        ...
        recur(..., v, ...)

This may caused by the scope/visibility problem of old version lua in vanilla

check the modification of function "copyTable" of AceDB-3.0 in Ace3 in this commit and the function "inheritDefaults" of AceDB-2.0 to see the detail