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This adds the pubkey33 manifest parameter type which was necessary for audit key during DAMP implementation.
Humid already supported a 32-byte x-only public key.
A 33-byte compressed key also carries a prefix identifying the point’s parity, so it requires a different encoding.
The encoder converts compressed key text into the tuple expected by the Simplicity compiler:
It preserves the X coordinate’s byte order, accepts an optional hexadecimal prefix, and normalizes case. It rejects x-only input, unsupported prefixes, malformed hexadecimal text and incorrect lengths. It validates the encoding’s shape.
It does not validate curve membership.