SplFileObject::seek broken in PHP7.2.x

[nyamsprod]

https://3v4l.org/tL8n9

This bug is reported to PHP bug system https://bugs.php.net/bug.php?id=75917&edit=2

A workaround should be made available in the Reader class to keep setHeader work as intended

    protected function setHeader(int $offset): array
    {
        $this->document->setFlags(SplFileObject::READ_CSV | SplFileObject::READ_AHEAD | SplFileObject::SKIP_EMPTY);
        $this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
        $this->document->seek($offset);
        //THIS NO LONGER WORKS
        if (empty($header = $this->document->current())) {
            throw new Exception(sprintf('The header record does not exist or is empty at offset: `%s`', $offset));
        }

        if (0 === $offset) {
            return $this->removeBOM($header, mb_strlen($this->getInputBOM()), $this->enclosure);
        }

        return $header;
    }

[nyamsprod]

using LimitIterator does not work as it uses the broken seek method.

[nyamsprod]

patch landed on master...