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From: Brandon Black <freedom@reardencode.com>
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Subject: Re: [bitcoin-dev] Combined CTV+APO to minimal TXHASH+CSFS
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Quick update to the proposal thanks to James O'Beirne: CTV is 2-bytes
less expensive than I thought when used alone. I thought that script
success required exactly OP_TRUE not just a CastToBool()=true value on
the stack.

This means that my proposal is 2 weight units (0.5vBytes) larger than
CTV when both are used in Tapscript.

--Brandon