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These assertions need to be added back into the nnbd sdk in order to be compatible with weak mode. Change-Id: Ie774fffda1fb0e79dbc7fe13cb75b9d28e4268fd Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/136720 Commit-Queue: Srujan Gaddam <srujzs@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com> Reviewed-by: Stephen Adams <sra@google.com>