9.0.1

Fixes:

• 76fd915 Fixed that ChangeSet was incorrectly counting item changes, by not including Refresh changes, and added corresponding tests. (#892) @JakenVeina
• 903afc8 Fixed ambiguous overloads for ObservableCacheEx.ExpireAfter() and ObservableListEx.ExpireAfter(). (#822) @JakenVeina
• 897beb8 fix polyfills visibility (#910) @kronic

Other:

• 6f45aa3 Observable comparers for SortAndBind (#884) @RolandPheasant
• a02c6d6 Added a shared/reusable implementation for multi-locking within stream operators, I.E. being able to process upstream notifications and downstream notifications at the same time, with different locks, while still preserving notification order. (#893) @JakenVeina
• 14c047f chore(deps): update dependency roslynator.analyzers to v4.12.3 (#857) @renovate[bot]
• c69556f chore(deps): update xunit-dotnet monorepo to v2.8.0 (#897) @renovate[bot]
• f9d1acf chore(deps): update dependency verify.xunit to v23.7.2 (#886) @renovate[bot]
• 00a702e Update ListEx.cs, missing char (#905) @kmgallahan
• 275cc2c New Virtualization operator (#888) @RolandPheasant
• cec559b [DO NOT MERGE]: IKeyValueCollection as IReadOnlyList (#874) @kronic
• a78094e chore(deps): update dependency microsoft.net.test.sdk to v17.10.0 (#908) @renovate[bot]
• 6b19fd5 chore(deps): update dependency microsoft.reactive.testing to v6.0.1 (#906) @renovate[bot]
• 5f4ddd2 chore(deps): update dependency system.reactive to v6.0.1 (#907) @renovate[bot]
• af2a29e IObservableList items as IReadOnlyList (#912) @kronic
• ad5d682 use null check pattern (#911) @kronic
• 7b04571 ToChangeSet now emits empty sets too (#916) @geferon
• 01d1119 New SortAndPage operator (#917) @RolandPheasant
• 7f2b220 Remove obsolete code (#918) @RolandPheasant
• 3382f7f Expose read only collections for source cache (#919) @RolandPheasant
• 254dff0 chore(deps): update dependency nerdbank.gitversioning to v3.6.139 (#915) @renovate[bot]
• 9d670db chore(deps): update dependency roslynator.analyzers to v4.12.4 (#914) @renovate[bot]
• f6a187f Upgrade to Version 9 (#920) @RolandPheasant