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>First, this extends deep into the core of Julia, and I don't see how a traits package would be involved with that.

No, Tim Holy described over dinner how all that was necessary to complete the existing traits packages was method deletion, and that's in v1.0.

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Interesting.

But as an external package it still has the issues I described as not being part of the defaults of the culture. Without that it just becomes a nice-to-have that only people serious about writing good quality, usable code are going to use. And these are the people most likely to have good documentation in any case.

Yes indeed, but the cultural issue can be addressed by adding it into Base in a 1.x since it's not breaking. I don't think it will make it into a 1.x though but it can.

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