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Update the documentation for rand() to note that it's not
cryptographically secure due to concerns that end-users are unaware of
this and use it in situations where security depends on the strength of
the randomness generated.
I'd have been happier getting this patch in earlier in the cycle.
We'd hoped to replace the RNG, but that didn't happen in time, so this
doc update is the "better, still not good" fallback.