Clarify about the length of a r field in invoice#865
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* In current spec, route-hint can't express more than 3 hops. * From a reader's point of view, what can not be done in a spec is often more important than what can be done. Thus clarify about its limitation.
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| * `fee_base_msat` (32 bits, big-endian) | ||
| * `fee_proportional_millionths` (32 bits, big-endian) | ||
| * `cltv_expiry_delta` (16 bits, big-endian) | ||
| * Be aware that `data_length` can express `2^10` (=1024 bits) as the longest, and a single hop will be 51 bytes (= 408 bits). So currently there is no way to specify a hint with more than two hops. |
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Weirdly, data_length is expressed in 5-bit amounts, so there is 5120 bits. You can fit 12 hops in there.
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