On Sat, Aug 11, 2018 at 11:29:41AM +0200, Pablo Rodriguez wrote:
> I realize that the fault is mine, but with backwards compatibility I
> meant that the same operation (10 + "10") gives different results with
> different Lua versions.
It doesn’t, it returns 10 in both cases. The difference is in the
behaviour of the print function. Try
print(10.0)
in Lua 5.2 and 5.3: the former prints 10, the latter 10.0. That is
consistent with the part of the specification you quote in another
email: in Lua >= 5.3, a number with a decimal point in it is always
interpreted as a float. If the number to be printed is the result of
some computation, however (instead of lexical analysis), a choice needs
to be made: that is where the change occurred, since in Lua 5.2 print
displayed the shortest possible representation, while in Lua 5.3 it
chose to interpret the number as a float. It’s a reasonable choice and
breaking compatibility for an elementary function such a print is to be
expected when such a change in the language occurred; even desirable, in
my opinion.
Best,
Arthur
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