Description:
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The doc documents SplFileObject::__toString as being an alias for SplFileObject::current.
When calling __toString explicitly, this indeed works (and can return an array when READ_CSV is used, which seems confusing)
But when casting a SplFileObject to a string, it will return the path to the file, like for the SplFileInfo parent class.

Test script:
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$tempFile = new \SplTempFileObject();
$tempFile->fwrite('foobar-');
$tempFile->rewind();

echo (string) $tempFile;
echo PHP_EOL;
echo $tempFile->__toString();

Expected result:
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Result according to the doc:

foobar-
foobar-

Actual result:
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php://temp
foobar-