976cffc4c2
strict-casts is mostly a drop-in replacement for the deprecated `implicit-casts: false` option. One big difference, seen in this CL, is that strict-casts will report a non-Iterable (or non-Stream) in a for-each loop. Change-Id: Ibc463ae9c870b6a795483c5dea0d2b856e7fd883 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/221546 Reviewed-by: Nicholas Shahan <nshahan@google.com> Commit-Queue: Samuel Rawlins <srawlins@google.com>