Revert "Merge pull request #20124 from umanwizard/backport_57.9_reverts" #20645
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Alternative to #20202 which includes TimelyDataflow/differential-dataflow#399.
Motivation
Tips for reviewer
Checklist
$T ⇔ Proto$T
mapping (possibly in a backwards-incompatible way), then it is tagged with aT-proto
label.