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This has been reported several times on regtest, most recently by Gijs van Dam. It turns out approx_max_feerate() was returning 0 in some corner cases: we should *not* be using that value (as shown, it's overly conservative) except as a ceiling on fee *increases*. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Changelog-Fixed: Protocol: don't ever send 0 fee_updates (regtest bug).