> why not use Bitcoin compact uint, which most PSBT consumers already implement?
I totally agree with that, compact int parsing is already implemented in all bitcoin applications, wallets and libraries. Also, for certain (mb proprietary) applications I will be willing to use multi-byte keys where the first byte defines the application type and next bytes define application-specific fields. I would suggest to set proprietary bytes to 0xF0-0xFC or to 0xE0-0xEF then (E for Enterprise?).
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