CSHARP-5368: Eliminiate allocations in Bson.Decimal128 to decimal conversion #1515
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See CSHARP-5368 for details.
This PR removes allocations that happens for
Enum.CompareTo(object? enum), because this results in boxing of both enums.The alternative is
Comparer<T>.Default.Comparfor .NET 6.0 and manual int-casts for .NET 4.x.decimal.GetBits(decimal d)allocates anint[4]array on every call.The alternative is
decimal.GetBits(decimal d, Span<int> destination), which allows you to pass a stack allocated int-array. This method is not available in .NET 4.x.