Completely untested with actual qrcodes: based on fact that python's set.symmetric_difference is analogous to XOR.
This is an exploration of extrapolating more XOR-mixed frames than have been received while reading a fountain qrcode.
ie: If we get 2 frames with parts [0, 1, 3, 5] and [3, 5, 7, 9], then we also have [0, 1, 7, 9]
Note: With seedsigner release 0.7.0 Monday September 11th 2023, edits
and maintenance of this gist are hereby frozen. As time moves forward, updates
to existing issues and pullrequests will make these links less accurate than they were
in the lead-up to this release. That is, altering the updated search term like
"<=2023-09-11" to exclude new activity will NOT be sufficient for expected results after release;
rather it would exclude entire issues and pull requests which DID have activity between 0.6.0 and 0.7.0.