Make Barrel and HttpCache singletons thread-safe #80
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Uses technique described by Jon Skeet here https://csharpindepth.com/articles/singleton#lazy
MSDN docs: https://docs.microsoft.com/en-us/dotnet/api/system.lazy-1
I couldn't test this on Android/iOS/macOS because I don't have a Xamarin development environment. Maybe you could test this with your neat Azure pipelines? Though feel free to decline this pull request if testing it would take too much of your time, since these changes usually aren't needed (I have a pretty specific use case where I need the singleton to be thread safe).
E: The tests passed, so I guess it should work?