in reply to A readline + -e oddity: readline opens files even with -e --- need "readline STDIN" to read from console

Another possibility would be to remove the consumed arguments from @ARGV: 
perl -e 'system splice @ARGV; readline' echo foo

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map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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In Section Meditations