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Why is the description field limited to 639 bytes? Every field in lightning invoice is of the form: type (5 bits) data_length (10 bits, big-endian) data (data_length x 5 bits) The data_length indicates the size of the data that is to be followed. Since data_length itself has a size of 10 bits, it can represent a number up to 1023 (210 -1). Thus the size ...