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BOLT 5: fix up opposing MUST & MUST NOT statements.
We can't say "MUST spend via HTLC-success" and "MUST NOT reveal preimage", since the HTLC-success does exactly that!
Let's simplify it. If you get the preimage from the outgoing HTLC, you need to spend the incoming.
Signed-off-by: Rusty Russell [email protected] See: dcf6b0f359c230ef140e336011890c96eea576fa