[cppx] Is C4099 really a sillywarning? (MSVC sillywarnings)

Evidently some people get to my blog by googling up C4099, the MSVC warning that you’ve used struct in one place and class in another place, for the same class. This is one of the alleged sillywarnings in my sillywarnings suppression header. But given e.g. the discussion at StackOverflow, is it really a sillywarning, or perhaps something to take seriously?

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