Revert IO#write changes in 0.35.0 and let it return Nil #9469
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Reverts #9233 and #9363, yet keeps some cleanup, minor fixes and the return type of
IO.copy
as Int64.You can read the motivations for reverting these changes at #9233 (comment)
Although is a breaking-change from 0.35.0, it's better to revert it now than make all the ecosystem adapt for the change in 0.35.0. That's why it's better to do it in 0.35.1.