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$ perl -MPOSIX -wle'print fpathconf(*STDOUT, _PC_PIPE_BUF)'
Argument "*main::STDOUT" isn't numeric in subroutine entry at -e line 
+1.
...
Name "main::FOO" used only once: possible typo at -e line 1.
Argument "*main::FOO" isn't numeric in subroutine entry at -e line 1.
4096

$ perl -wle'print 0+*STDOUT'
Argument "*main::STDOUT" isn't numeric in addition (+) at -e line 1.
...
Name "main::FOO" used only once: possible typo at -e line 1.
Argument "*main::FOO" isn't numeric in addition (+) at -e line 1.
0