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grepping the code without the tests doesn't seem that compelling a use case to me, given that grep and find both provide options to prune directories. I do think that moving the tests out of the email package will make it harder to maintain and distribute as a separate package. However, if RDM thinks the burden won't be too high, and the advantages of a split outweigh the disadvantages, then I defer to him. I would still make a case for distributing email6 as a package available on Cheeseshop though, otherwise it just won't get much independent use until it's in the stdlib.