perlhist Perl history records
perldelta Perl changes since previous version
+ perl5256delta Perl changes in version 5.25.6
+ perl5255delta Perl changes in version 5.25.5
perl5254delta Perl changes in version 5.25.4
perl5253delta Perl changes in version 5.25.3
perl5252delta Perl changes in version 5.25.2