Iterating weak tables in Lua 5.1?

[Mark Hamburg <mhamburg@...>]

I moved to Lua 5.1work2 this morning. We are getting occasional errors about
next not being happy with table keys. The code in question looks like the
following:

    for item, _ in pairs( items ) do
        items[ item ] = nil
        process( item )
    end

The additional catch is that items is a weak table.

Has weak table iteration become more dangerous in Lua 5.1? Do I need to turn
off the garbage collector around this code?

Thanks.
Mark