In some weird situations it may happen that some channel along the route
could have htlcmax=htlcmin, so that the supremum of htlcmin and the
infimum of htlcmax are the same number. In that case there is only one
allowed amount that can go through that route.
Without this patch renepay would not handle correctly this cornercase.
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).
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