08z isn't numeric literal, but: 

$ perl -E'say 08z => 1'
Illegal octal digit '8' at -e line 1, at end of line
syntax error at -e line 1, near "08z"
Execution of -e aborted due to compilation errors.

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In reply to Re^2: Clarifying the Comma Operator by zwon
in thread Clarifying the Comma Operator by ig

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