>What if the builtin has more features? This is the common case for
>ksh93 in Opensolaris.

It's still a bug.  

>Re performance in interactive shells: Did you ever used loops over
>many files in interactive mode? This is a COMMON usage.

Again, we're still talking about profile shells; and while it is perhaps 
possible to measure a difference between builtin-commands in a loop, I 
doubt that you can actually notice the difference.

Casper

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