Rob Mueller wrote: [...]
Ok, so to summarise, I think I see two problems here: 1. Assigning an untainted value to a value that was previously tainted leaves the new value tainted
It's hard to tell or even try to reproduce that, since you didn't show a real test case. What kind of variable is that? my, our, global? Usually a variable that once became PVMG, won't go back to a lower type PV. But it should not have the MG flags set.
2. join with utf-8 strings doesn't seem to leave the joined string with the utf-8 flag on
I'd try to minimize your setup to exclude everything but the code at fault. This can be done easily using geoff's bugreport skeleton available from here [1]. See first if you still have a problem using it. It could be that some other code that you load affects your whole setup. And you can't reproduce it with a shell script since you don't load the same setup there.
If you could submit a separate bugreport tar ball [1] for each of the issues you have raised, each including a shortest possible code, then it'll be much easier for us to try to reproduce your case and only then try to find a fix.
Thanks.
[1] http://perl.apache.org/docs/1.0/guide/help.html#How_to_Report_Problems (scroll down a bit)
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