> perl5 -E 'say 3e-1 - .3'
0

##</code><code>##

> perl6 -e 'say 3e-1 - .3'
5.55111512312578e-17

##</code><code>##

> printf "%.100f\n", .3;
0.3000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
>