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Am 21.08.2015 um 13:43 schröbte Liam Devine:
Lua 5.3 returns positive infinity for a negative zero denominator, which
is a change from 5.1, 5.2 and LuaJIT. Unless I am missing something,
this does not seem to be fixed in 5.3.1 or listed on the bug page[1].

liam@dmail00:~$ lua53
Lua 5.3.0  Copyright (C) 1994-2015, PUC-Rio
return 1/-0

There is no negative zero integer. Try `1/-0.0`.