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- Subject: Re: [ANN] Lua 5.3.0 (rc1) now available
- From: Roberto Ierusalimschy <roberto@...>
- Date: Thu, 18 Dec 2014 11:02:28 -0200
> Since 2.7 "has no integer representation", I could think that
> '2' also hasn't. But that is not what happens:
> Lua 5.3.0 Copyright (C) 1994-2014 Lua.org, PUC-Rio
> >return string.format("%d", '2.7')
> stdin:1: bad argument #2 to 'format' (number has no integer representation)
> stack traceback:
> [C]: in function 'string.format'
> stdin:1: in main chunk
> [C]: in ?
> >return string.format("%d", '2')
> >return string.format("%d", '2.0')
> What is the rationale? Are you considering a change on automatic
> coercion? It will probably produce a great compatibility problem but
> it may be worth it...
The main difference here is that, unlike the coercion from floats to
integers---which was always undefined and, as my quiz shows, nobody
really knows how it works---the coercion from strings to numbers has
always been well defined and mostly everybody knows how it works.