I forget where this is described in the docs

perldoc -f stat, search for the paragraph starting with "If stat is passed the special filehandle consisting of an underline". And the -X file tests use stat() as described in their introductory paragraph, which is why -d _ uses the same special filehandle as stat(_) .

In reply to Re^4: Incomplete file write under Dancer2 by pryrt
in thread Incomplete file write under Dancer2 by realflash

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