>perl -e"CORE::say $^X"
C:\progs\sp5302x64\perl\bin\perl.exe

>perl -v | find "This is"
This is perl 5, version 30, subversion 2 (v5.30.2) built for MSWin32-x64-multi-thread

>perl -V:nvsize
nvsize='8';

>perl -V:ccflags
ccflags=' -s -O2 -DWIN32 -DWIN64 -DCONSERVATIVE -D__USE_MINGW_ANSI_STDIO -DPERL_TEXTMODE_SCRIPTS -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -fwrapv -fno-strict-aliasing -mms-bitfields';

>perl -e"CORE::say sprintf '%.20g', 0.1"
0.10000000000000000555

##</code><code>##

$ uname -a
Linux tribble 4.4.0-18362-Microsoft #476-Microsoft Fri Nov 01 16:53:00 PST 2019 x86_64 x86_64 x86_64 GNU/Linux

$ perl -v | grep 'This is'
This is perl 5, version 30, subversion 2 (v5.30.2) built for x86_64-linux-thread-multi

$ perl -V:nvsize
nvsize='8';

$ perl -e'CORE::say sprintf "%.20g", 0.1'
0.10000000000000001