Apparently, in our current public headers (i.e. those called sd-*.h) we suffixed typedefs that we use as values with _t, but we didn't do this for enum typedefs. Fix that while this stuff is not actually public yet. With this scheme "value typedefs" now end systematically in _t, and "object typedefs" (i.e. structures that are typically passed around via pointers and not values) do not. No code changes, just some renaming.
System and Service Manager
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