As per BOLT recommendation https://github.com/lightning/bolts/pull/1232, this means we will insist on this being available. For CLN, we added this in 0.12.0 (2022-08-23), though there were fixes as late as 24.02. Either way that's well outside our support window. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Closes: https://github.com/ElementsProject/lightning/issues/8152 Changelog-Changed: Protocol: We now insist that peers support `option_channel_type` (in CLN since 0.12.0 in late 2022, similar for other implementations).
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