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On 13-6-2012 19:38, Roberto Ierusalimschy wrote:

What precisely are we talking about?

(1)  1 + "2"  (- * / etc)

(2)  1 .. "2"

(3)  concat({1,"2"})

(4)  format("%s",1)

I suppose only in the first case automatic conversion is unwanted?
Actually I can imagine that a future concat does a tostring if
needed so that { 1, "2", true } also works.


I am talking mostly about (1). (2) could be kept, but probably
implemented through some metamethod by the standard library.
(3), (4), and others could be handled on an individual basis. (For
instance, does anyone need string.gsub(10000, 0, 1)?)
I don't think so (or at least not deliberately) so indeed such conversion cases can go as well. (To be honest, I wasn't even aware of it being accepted so I never tried something like that.)
Concerning (2): not all types have metatables so boolean is still somewhat of a problem then. (I can live with it.) 

Hans

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