There is no major upcoming Go change related to this post. This is just a much longer version of https://research.swtch.com/plmm#ub https://research.swtch.com/p

There is no major upcoming Go change related to this post. This is just a much longer version of https://research.swtch.com/plmm#ub https://research.swtch.com/plmm#ub that I drafted years ago and finally cleaned up enough to post.