If that were the case, then $ERRNO should not say
If used numerically, yields the current value of the C errno variable
and
You can assign a number to $! to set errno
The OP did nothing unreasonable. ikegami has settled the matter, in my opinion. It was a bug, it has been fixed.

In reply to Re^4: Different behaviour of 'stat' function after assignment to $! (errno). by jpl
in thread Different behaviour of 'stat' function after assignment to $! (errno). by muxxum

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