minFinalExpiryDelta is not optional#2195
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I got confused at first: we cannot put a hard requirement on the existence of that field in Bolt11Invoice along the existing ones, because it wasn't always mandatory (lightning/bolts#785):
require(tags.collect { case _: Bolt11Invoice.MinFinalCltvExpiry=> }.size == 1, "there must be exactly one min_final_cltv_expiry tag")
An invoice that doesn't explicitly set min_final_cltv_expiry has an default min_final_cltv_expiry of 18. This default allows invoices to be slightly shorter but does not mean that the min_final_cltv_expiry can be unknown and needs to be provided from somewhere else.
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Codecov Report
@@ Coverage Diff @@
## master #2195 +/- ##
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- Coverage 83.95% 83.95% -0.01%
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Files 186 186
Lines 13916 13915 -1
Branches 578 564 -14
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- Hits 11683 11682 -1
Misses 2233 2233
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In invoices,
minFinalCltvExpiryDeltais not optional.An invoice that doesn't explicitly set min_final_cltv_expiry has an default min_final_cltv_expiry of 18.
This default allows invoices to be slightly shorter but does not mean that the min_final_cltv_expiry can be unknown and needs to be provided from somewhere else.