On Tue, Aug 02, 2016 at 10:55:34AM -0700, Zefram wrote: > These literals work fine in other contexts: > > > my $a = 1180591620717411303424e0 > 1.18059162071741e+21 > > my $b = 1180591620717409992704e0 > 1.18059162071741e+21 > > $a.Int > 1180591620717411303424 > > $b.Int > 1180591620717409992704 > > $a == $b > False > > $a === $b > False
It's not universally true that Num literals like these "work fine in other contexts" -- the pair of literals in the example given "work" because they differ in the fifteenth decimal digit of precision. This is within the acceptable norms for Num (floating point) precision. Choosing a different pair of literal values that differ beyond the first 15 digits of precision shows that things do not work fine in other contexts: > my $a = 1180591620717411303424e0 1.18059162071741e+21 > my $b = 1180591620717411333333e0 1.18059162071741e+21 > $a.Int 1180591620717411303424 > $b.Int 1180591620717411303424 > $a == $b True > $a === $b True In short, it's "normal" (expected behavior) for mathematical errors to occur beyond 15 digits of precision in Num (floating point) values. Pm
