Toward the end of the Comma Operator section in perlop it says:

If the argument on the left is not a word, it is first interpreted as an expression, and then the string value of that is used.

which is consistent with observed behaviour.

True laziness is hard work

In reply to Re^3: Illegal octal digit error by GrandFather
in thread Illegal octal digit error by lakshmananindia

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