What does “size_is” mean in an IDL file?

My boss (who has spent a really long time working on RPC) and I got into a discussion the other day about the “size_is” IDL attribute (yeah, that’s what Microsoft developers chat about when they’re bored). For context, there are two related attributes which are applied to an array in IDL files.  size_is(xxx) and length_is(xxx). …

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