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What's the difference?

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All stages · Demo 164

UPC-A mill

Choice grocery / case / pharma. Twelve digits. Odd positions from the left ×3. Jev does not sum the barcode.

ChoiceUPC-A after class

A stub barcode. 036000291452 scans; a one-off twelfth digit rejects. Eleven-digit cases never reach UPC-A.

replaykind —upc —

STANDBY

All 4056 stages

Educational stage on jev.page — not the official TypeSafe console. Live calls go to POST https://api.typesafe.ai/v1/systemone from your browser when you paste a key. Without a key, the stage plays a recorded decision shaped like jev-1.13.0. Jev does not write the UI copy.