As of C# 7.0 async methods can return ValueTask<T>. The explanation says that it should be used when we have a cached result or simulating async via synchronous code. However I still do not understand what is the problem with using ValueTask always or in fact why async/await wasn't built with a value type from the start. When would ValueTask fail to do the job?
C# – Why would one use Task over ValueTask in C#
asynchronousc
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Best Answer
From the API docs (emphasis added):