Re: [ANN] Lua 5.3.0 (work2) now available
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- Subject: Re: [ANN] Lua 5.3.0 (work2) now available
- From: Dirk Laurie <dirk.laurie@...>
- Date: 2014年3月24日 07:49:52 +0200
2014年03月24日 2:06 GMT+02:00 Bernd Eggink <monoped@sudrala.de>:
> Is it really intended that
>
> a = math.max(1, 2)
>
> returns a = 2.0 (a float)? This change in behaviour, besides being very
> counterintuitive, kills a lot of my modules which rely on tostring(a) giving
> "2" (without a decimal part). It means that I would have to surround each
> such operation with an ifloor() call, which is pretty ineffective and
> annoying.
> If that can't be changed, I'd suggest an addition of imin(), imax() and
> iabs(), witch return integers.
In Lua 5.2, a = math.max(1, 2) returned that same double.
The change in behaviour is that a double with the integer value 2 gets
tostring-ed to "2.0", not to "2". You can restore the original behaviour thus:
$ lua53
Lua 5.3.0 (work2) Copyright (C) 1994-2014 Lua.org, PUC-Rio
> math.max(1,2)
2.0
> debug.setmetatable(0,{__tostring = function(x) return ("%.14g"):format(x) end})
0
> math.max(1,2)
2