gc-arena

• Adds a Collect impl for hashbrown::HashTable.

• Add the ability to transition from a fully marked arena immediately into CollectionPhase::Collecting.

• Correct the behavior of Arena::mark_debt and Arena::mark_all to do what their documentation suggest and do nothing during CollectionPhase::Collecting
• Implement Collect for std::collections::LinkedList
• Make StaticCollect<T> #[repr(transparent)], to support sound casting from Gc<StaticCollect<T>> to Gc<T>.

This release adds the concept of "finalization" to arenas. At the end of the "mark" phase, at the moment that an arena is considered "fully marked" and is ready to transition to the "sweep" phase, the "fully marked" arena can be examined with some special powers...

MarkedArena::finalize can be called to check which pointers are considered "dead" for this collection cycle. A "dead" pointer...

This release adds the ability to track external allocations (allocations which are not stored in a Gc<T>) which also participate in pacing the garbage collector. There is now a new (feature-gated) type allocator_api::MetricsAlloc which implements the allocator-api2::Allocator trait which can be used to automatically track the external allocation of collection types.

This release als...