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I expect a compiler error about not being able to implicitly convert an int to a string, but instead, the function returns a dynamic object, which is different from the method specification.
Created attachment 12901 [details]
.cs file showcasing the problem
Compile using mcs /target:library BuggyClass.cs
Running is not relevant.
Mono C# compiler version 22.214.171.124
That's feature of dynamic binder. You are passing a dynamic object in which in this case is ExpandoObject but that's not known to compiler and it can be anything therefore this method may not even match. You get correct error during execution when the actual overload resolution happens