v3.3.13

• TreeReferenceMap:

  • Replaced _purged field type from DualWeakMap to DualLazyWeakMap.
  • Use global LazyWeakReferenceManagerByType to create DualLazyWeakMap instances for purged entries.

• ExpandoWithFinalizer:

  • Refactored to extend generic WithFinalizer base class.
  • Introduced strongly typed FinalizerValueWrapper abstraction and concrete implementations:
    • SimpleFinalizerWrapper, SimpleFinalizerWrapperDebug
    • ExpandoValueWrapper, ExpandoValueWrapperDebug
  • Added AttachOnlyFinalizer class for write-only finalizer usage.
  • Added debug mode to retain weak references to keys for inspection.
  • Improved finalizer attach/detach logic and wrapper management.

• lazy_weak_reference.dart:

  • Added GenericReference interface for strong/weak reference abstraction.
  • Added LazyWeakReferenceManagerByType singleton managing per-type LazyWeakReferenceManager instances.
  • Added toString and compareTo improvements to LazyWeakReference.
  • Added LazyWeakReferenceManagerByType class for centralized management.
  • Added toString override to LazyWeakReferenceManager.

• weak_map.dart:

  • Refactored internal entry classes to support lazy weak references:
    • Added _EntryLazyRef, _EntryLazyRef1, _EntryLazyRef2, _EntryLazyRefValue.
  • WeakKeyMap: include _autoPurge in isAutoPurgeRequired and centralize auto-purge check.
  • Added LazyWeakKeyMap subclass using lazy weak references for keys.
  • Added DualLazyWeakMap subclass using lazy weak references for keys and values.
  • Added factory constructors WeakKeyMap.configured and DualWeakMap.configured to create lazy weak reference variants.
  • Added removeWhereKey extension method on Map and WeakKeyMap.
  • Updated purge logic to use removeWhereKey.
  • Updated DualWeakMap to optionally use lazy weak references for keys and values.

• resource.dart:

  • Changed ResourceContentCache to use private _onLoadEventStream instead of public onLoad field.
  • Updated ResourceContent to lazily initialize _onLoadEventStream and use it internally.
  • Changed event notification to use _onLoadEventStream?.add instead of onLoad.add.