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Motivation and Context
Seal internal types.
Description
These would normally be flagged by CA1852, but it's currently unable to handle assemblies marked as InternalsVisibleTo, and all of these assemblies are. Sealing internal types is generally a good practice as a) it can always be changed so there's little downside, b) it can help to communicate to elsewhere in the project whether the type is intended to be derived from (just as using visibility on members communicates what should / shouldn't be used), and c) it can help with performance in some situations, especially on .NET Core.
Contribution Checklist
dotnet format