I'm looking at `seL4_GetMR()` and `seL4_SetMR()`, which requires a syscall
for each get/set. To my naive eye, it seems like you're much better off
running `seL4_GetIPCBuffer()->msg` then reading/writing to each index as
needed, turning multiple syscalls (one for each get/set) into just the one.

Am I missing anything? I was planning on replacing my Get/Set calls with
direct array writes, but I'm wondering if I've missed reasons why I
shouldn't.

Thanks,
Ben
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