Ok.
But, just for the record, I have been using
Lua Code:
savedvars.items[i].uniqueid = tostring(GetItemUniqueId(bag, slot))
and
Lua Code:
if (AreId64sEqual(tonumber(savedvars.items[i].uniqueid), GetItemUniqueId(bag, slot))) then ...<stuff>... end
For months, and it was working flawlessly until the last incremental patch.
But I have already taken your advice and fixed my addon (not released, still in alpha-testing).
So thank you very much for your replies, Sirinsidiator. btw, I love your addons!