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Reject callback with :string return type
Callbacks returning a :string type were not supported so far and did not work. It was possible to define such a callback, but the value returned was NULL in any case. This implementation rejects :string return type of callbacks at the definition. The reason for the reject is the following: In contrast to :string parameters to called functions there is no well defined ownership of the memory of the string returned by callbacks. Instead an explicit FFI::MemoryPointer or similar should be used, which allows to track the validity of underlying memory instead of relying on some Ruby implementation details. Fixes #751
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