Add missing export symbol and suppress dll-interface warnings for MSVC #221
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MSVC was complaining about this free function and wouldn't link the library with the clients.
There were also countless dll-interface warnings which were polluting the compilation output. See also here:
https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4251?view=msvc-160
My understanding is that all these messages are related to STL-derived types in various places.