ACK

ACK the reorder, because it's good forward progress... but rule 1 is ambiguous. It can be read as if a hybrid pubkey in a txout is not permitted.

The rule 1 for any input in block v3 may make some existing spendable (and currently IsStandard) txouts forever unspendable, because of P2SH we can't even know in advance which ones it would slay. Are we really okay with that?

The intention was indeed to disallow hybrid pubkeys, but you raise a very good point. I don't think hybrid keys are actually used, but there are many cases of invalid public keys inside multisig which would also potentially become invalid due to this rule - especially as the rule is only applied on spending, this could potentially make actual coins unspendable.

Too bad, but that needs fixing.

I removed the language about public keys again.

ACK