I'm aware of this, but I'm on a (silly, I know) quest for ways to avoid these annoying messages without setting up a block solely for this purpose.
BTW, when I want to find out the category of warnings to turn off I trigger the warning under diagnostics, whose output lists the categories of the warnings emitted. I don't think I've ever had reason to avail myself of the hierarchical organization of warnings; I always turn off the most specific level corresponding to a particular warning.
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