RESERVED - The numbers assigned in this enumeration match the failure codes as
defined in BOLT #4. Because protobuf 3 requires enums to start with 0,
a RESERVED value is added.
TEMPORARY_CHANNEL_FAILURE
TEMPORARY_CHANNEL_FAILURE:15
TEMPORARY_NODE_FAILURE
TEMPORARY_NODE_FAILURE:19
UNKNOWN_FAILURE
UNKNOWN_FAILURE:998
UNKNOWN_FAILURE - The error source is known, but the failure itself couldn't be decoded.
UNKNOWN_NEXT_PEER
UNKNOWN_NEXT_PEER:18
UNREADABLE_FAILURE
UNREADABLE_FAILURE:999
UNREADABLE_FAILURE - An unreadable failure result is returned if the received failure message
cannot be decrypted. In that case the error source is unknown.
INTERNAL_FAILURE - An internal error occurred.