Some people still argue that rand(3) and random(3) have suitable deterministic

Some people still argue that rand(3) and random(3) have suitable deterministic
use cases, so explain the situation a bit more.  Since the 80's, I estimate
around 5 algorithm changes, so any chosen seed is unrepeatable UB.

+The deterministic sequence algorithm changed a number of times since
+original development, is underspecified, and should not be relied upon to
+remain consistent between platforms and over time.

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