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Subject: Re: [bitcoin-dev] Dealing with OP_IF and OP_NOTIF malleability
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> One and zero should be defined as arrays of length one. Otherwise, it =
is still possible to mutate the transaction by changing the length of =
the array.=20
>=20
> They should also be minimally encoded but that is covered by previous =
rules.

These two lines contradict each other. Minimally-encoded "zero" is an =
array of length zero, not one. I'd suggest defining this explicitly here =
as "IF/NOTIF argument must be either zero-length array or a single byte =
0x01".