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Issue is here: https://github.com/mono/mono/blob/0239710/mono/profiler/log.c#L2660-L2662
Problem is that mono_counter_get_type, mono_counter_get_unit and mono_counter_get_variance are not returning byte but uint, which are just masked. So I think log.c should do the shifting to get value into 0-255 range. Also notice that enums in managed reader needs fixing.
We should just emit them as-is but encoded as LEB128 for simplicity and value parity with mono-counters.h.