Treating compatibility as a hard constraint is easy to second-guess, but pays off in spades. Fragmentation caused by breaking hurts a lot.
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Replying to @tshepang_dev @wycats
Python 3 (still hurting!), Rails 3 (Github maintained 2.x for years), ActionScript 3, Itanium (beaten by x64), ...
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Replying to @Gankro @tshepang_dev
it's not a coincidence that I'm both responsible for the biggest Rails 3 breaks and have found religion on compat :)
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Rails 3 and Ruby 1.9 both skated close to the edge and survived. Py3, AS3, Perl6 are clearly over the line.
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ObjC -> Swift is still an open question in my mind.
1:40 PM - 1 Aug 2016
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