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lnwire: increase onion failure message length to 1024 #6916

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@joostjager joostjager commented Sep 14, 2022

Implements lightning/bolts#1021

This can only be merged when most senders accept longer failure messages (#6913).

Longer failure messages are unreadable for older senders. They won't be able to properly penalize the error source.

This fixes an incompatibility where lnd enforces a strict 256 byte
failure message, where as the spec sets this only as the recommended
length.
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