GHSA-J3W3-P6MR-3HRH DynFuture Drop Can Construct a Dangling Reference

DynFuture is unsound because its Drop implementation transmutes a trait-object reference into unrelated reference types, which constructs an invalid reference from trait object metadata. This issue was reproduced against dyn-future 3.0.4 under Miri. The crate is unmaintained...