+ /// Set to commit to an upfront shutdown_pubkey at channel opening. In case of mutual
+ /// closing, the other peer will check that our closing transction output is encumbered
+ /// by the provided script.
+ ///
+ /// We set it by default as this ensure greater security to the user funds.
+ ///
+ /// This cannot be changed after channel opening.
+ pub commit_upfront_shutdown_pubkey: bool