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Sync "Lookup" + "Grouping" from .NET 7 sources (#879)
See also: - https://github.com/dotnet/runtime/blob/v7.0.0/src/libraries/System.Linq/src/System/Linq/Lookup.cs - https://github.com/dotnet/runtime/blob/v7.0.0/src/libraries/System.Linq/src/System/Linq/Grouping.cs#L48-L141
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