Limit session IDs to a non-negative, pseudo-random int32 #664
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Technically, this reduces the set from which session IDs are drawn by (9.999.999.999 - 2.147.483.647) = 7.852.516.352, say 75%.
Practically, ~2e10 possible session IDs should be large enough to avoid collisions in the real-world.
This fixes an int overflow for 386 architectures.
Fixes #663