fix: preserve connection task coalescing#920

brentechols wants to merge 3 commits into

hyperium:sean/bye-bye-big-mutexhyperium/h2:sean/bye-bye-big-mutexfrom

brentechols:fix-pr917-window-update-coalescingbrentechols/h2:fix-pr917-window-update-coalescingCopy head branch name to clipboard