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Bound arena retention by bytes instead of object count #38488

Job	Run time
test extra (ubuntu-latest)	7m 37s
build	3m 30s
smoke	3m 0s
misc	37s
extension	26s
lint (ubuntu-latest)	8m 12s
generate	5m 7s
go-test	7m 39s
tidy	55s
test (linux arm64)	9m 15s
test (ubuntu-latest)	13m 43s
lint (noembed)	6m 6s
test extra (windows-latest)	11m 47s
test (windows-latest)	20m 35s
package-feed-proxy	1m 0s
test (concurrent test programs)	14m 34s
test (race mode)	2h 18m 55s
release-build	13m 39s
format	1m 18s
test (noembed)	7m 48s
lint (windows-latest)	11m 56s
codegen	6m 31s
test (windows arm64)	17m 41s
required	3s
	5h 11m 54s