[racket-dev] location of foldts?

Currently, 'foldts' is provided by rackunit.  Not surprisingly, the sxml stuff also provides foldts.  I'd rather just have one copy--especially because 'except-in' requires seem to sometimes incur large performance penalties--but I'm not really sure where that "right place" is. Honestly, I don't really think it belongs in rackunit, but I'm willing to be overruled.

Can we do one of these? 
1) not provide it from rackunit,
2) not provide it from rackunit and put it somewhere else, or
3) tell me that I'm wrong, and I'll just add a dependency from my sxml package to rackunit?

John
 
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