I use 5.6.x so don't actually have bigint. This is called obfuscation after all :-) The reason it does not work is that => is just a synonym for , in Perl so it reads use, bigint Or it should. Actually that , syntax parses as an error, whereas => syntax is OK GOK?
C:\>type test.pl use, strict C:\>perl -MO=Deparse test.pl syntax error at test.pl line 1, near "use," test.pl had compilation errors. C:\>type test.pl use => strict C:\>perl -MO=Deparse test.pl '???', '???'; test.pl syntax OK C:\>