cc736dfb65
This reapplies commit0c05e33836and reverts the revert029e0cec71. Tested: Added few new tests, updated existing. Mainly regression testing. CoreLibraryReviewExempt: Reviewed in original CL. Change-Id: Ifcc79ce2f9375f607722643a04957b0961e6c295 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/284304 Reviewed-by: Ömer Ağacan <omersa@google.com> Commit-Queue: Lasse Nielsen <lrn@google.com> Reviewed-by: Aske Simon Christensen <askesc@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>