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FastqIter now returns a boolean on first iteration and a sequence record afterwards. This violates the principle of least surprise.
Two headers is now determined by peeking the file. I did not implement a full-fledged FASTQ parsing algorithm there as any errors in the FASTQ are likely revealed by FastqIter with an appropriate error.
Because of this change FastqReader._iter can now be properly typed and FastqIter can be safely and intuitively be used by other projects.
EDIT: I also found a small mistake in
_core.pyi
that I have corrected here, but I could do that separately if you do not wish to merge this.fixes #38