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> Err, but this is a genuine bug, not a new feature.

I agree it's annoying but I don't think it's a bug: Lua is based on C89
which (unlike C99) does not say much about floating-point types; there's
certainly no mention of negative 0 and signed infinities. The only way
to distinguish -0 from 0 is to compute their inverses, which is clearly
a troublesome operation if you're not running on IEEE 754 hardware.

> IMHO a fix for it should be merged into Lua 5.1.5 (like all the other
> pending bug fixes).

It probably will if there is a Lua 5.1.5 (also probable).