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This formalises my occasional habit of using a single malloc to make a block that contains a header structure and a data buffer that a field of the structure will point to, allowing it to be freed in one go later. Previously I had to do this by hand, losing the type-checking advantages of snew; now I've written an snew-style macro to do the job, plus an accessor macro to cleanly get the auxiliary buffer pointer afterwards, and switched existing instances of the pattern over to using that.