Setting up an alias in your shell's rc file helps - for bash:
alias sperl='env PERL5OPT="-Mstrict -Mwarnings" perl'
You keep running your oneliners without strictures; but if something blows or feels fishy, you just interrupt and type
prompt$ s!!
to run your latest command under strict and warnings.
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'
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