You have the correct answer. And indeed it is addressed in the documentation. unlink0 performs checks that depend on having both the filename and the open filehandle, and if you do the close yourself it cannot verify that the close was safe.

In reply to Re: tilly (4) scratching the surface of File::Temp (unlink w/o $filehandle ?) by tilly
in thread (code) scratching the surface of File::Temp by ybiC

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