garbagecollect

private.data = setmetatable({}, {__mode = 'k'})
private.db = setmetatable({}, {__mode = 'kv'})

---@param self Object
---@param obj any
function newObject(self, obj, destructor)
    local priv = {
        obj = obj,
        destructor = destructor
    }
    private.data[self] = setmetatable(priv, private.metatable)
    private.db[obj] = self
end

function destroy(priv)
    if priv.obj then
        priv.destructor(priv.obj)
    end
    priv.obj = nil
end

private.metatable = {
    __gc = destroy
}