math.random returning out of range values

[Rena <hyperhacker@...>]

Just noticed on Lua 5.1, on a 32-bit machine, math.random(0,
0x7FFFFFFF) always returns a negative number:
> return math.random(0, 0x7FFFFFFF)
-1649760493

0x7FFFFFFE has no such issue. 0x80000000 and up give an error which is
a bit nonsensical, but I at least understand why:
> return math.random(0, 0x80000000)
stdin:1: bad argument #2 to 'random' (interval is empty)

-- 
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