Fix bug #52335: fseek() on memory stream behavior different than file #12058
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This changes memory stream to allow seeking past end which makes it the same as seeking on files. It means the position is allowed to be higher than the string length. The size only increases if data is appended to the past position. The space between the previous string and position is filled with zero bytes.
Except other things this also allows seeking on
php://inputbefore data is written into it and thus fixes #9441.