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Thanks for the feedback! For anyone reading this — the post actually covers those exact stages: byte-mode encoding (UTF-8), Reed-Solomon error correction over GF(256), matrix construction, and mask penalty scoring. On edge cases: I validated the encoder against Python's qrcode library on 48/48 test cases across all mask patterns, including long strings and version capacity limits (v1–v10). The full source is on GitHub if you want to see how the pieces fit together. Good luck with your own JS projects!
