>Christof,
>
>Further proof is to change the tag of that code to:
>
>index on bintoc(i1) to itest.idx
>
>the result file looks the same as without the bintoc(). But I wouldn't advocate using bintoc() in your tag expressions.

Any good reason for that? I don't expect that the result of BinToC() should change in next versions, nor that it would vanish - since it's probably an internal function. I just started using it, and it behaves just nice (yes, I know I have to have Collating Sequence "machine" on binary tags), and combines the speed of integer index with ability to add some string to the end of it.

OK, I'm biased - I like this thingy. Still, what's the reason against it?