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Bound arena retention by bytes instead of object count #38710

Job	Run time
smoke	4m 55s
test extra (ubuntu-latest)	8m 51s
release-build	13m 8s
package-feed-proxy	35s
lint (ubuntu-latest)	5m 30s
lint (windows-latest)	9m 11s
generate	4m 16s
go-test	9m 28s
test (noembed)	8m 17s
tidy	1m 3s
extension	30s
lint (noembed)	8m 5s
format	54s
test (ubuntu-latest)	13m 37s
codegen	7m 23s
test (windows-latest)	18m 19s
build	3m 28s
test (concurrent test programs)	8m 48s
test (race mode)	19m 51s
test extra (windows-latest)	12m 30s
test (windows arm64)	17m 27s
test (linux arm64)	6m 9s
misc	58s
required	6s
	3h 3m 19s