C:>perl -MConfig -le "print +5.3130431399669280e-34; printf qq($_\n), +5.3130431399669280e-34 for qw/%.17f %.17e %.17g/; print qq($^V\t|\t$Config{myuname})"
5.31304313996693e-34
0.00000000000000000
5.31304313996692843e-34
5.3130431399669284e-34
v5.30.0 |       Win32 strawberry-perl 5.30.0.1 #1 Thu May 23 12:20:46 2019 x64