Improve type of typed-array load - Typed array elements are never null, but type inference sometimes thinks they are. - Annotated isNan and isFinite as pure. Change-Id: I5fffd237374444db27665009cf550b26563bcf55 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98046 Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Stephen Adams <sra@google.com>
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