Fix GH-9883 SplFileObject::__toString() reads next line

We need to overwrite the __toString magic method for SplFileObject, similarly to how DirectoryIterator overwrites it
Moreover, th

Fix GH-9883 SplFileObject::__toString() reads next line

We need to overwrite the __toString magic method for SplFileObject, similarly to how DirectoryIterator overwrites it
Moreover, the custom cast handler is useless as we define __toString methods, so use the standard one instead.

Closes GH-9912

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