Indeed, it interprets an integer as C type "long" or "unsigned long". But %f is a conversion for floats, not integers.

Also, I still don't see anything in the perldelta manpage that either deprecates the "%lf" or mentions that there has been a change in syntax.

It actually might be this:

       o   The Gconvert macro ($Config{d_Gconvert}) used by perl
           for stringifying floating-point numbers is now more
           picky about using sprintf %.*g rules for the conver-
           sion.  Some platforms that used to use gcvt may now
           resort to the slower sprintf.
[download]

But I'm not sure. And not everything is documented, the people working on Perl are only human!

Abigail

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