554e637a35beef3e9bc7c882f2f6a322a415b6b6
https://dart-review.googlesource.com/c/sdk/+/370663 makes ExternalDartReference generic. By doing so, it triggers two cast_nullable_to_non_nullable lints that need to be silenced for it to land. Once the above SDK changes land, this can be refactored to utilize the generic and avoid the manual cast altogether.
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