[t-bast]

This was missing from the spec, but is more flexible and clearer than inheriting values from the previous attempt. The dual funding specification added this in lightning/bolts@27ffef4

Fixes #2782

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.89%. Comparing base (61f1e1f) to head (5aa515d).
⚠️ Report is 221 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2783      +/-   ##
==========================================
+ Coverage   85.85%   85.89%   +0.04%     
==========================================
  Files         216      216              
  Lines       18188    18201      +13     
  Branches      780      776       -4     
==========================================
+ Hits        15615    15634      +19     
+ Misses       2573     2567       -6     

Files with missing lines	Coverage Δ
...inq/eclair/channel/fsm/ChannelOpenDualFunded.scala	87.03% <100.00%> (+0.55%)	⬆️
...ala/fr/acinq/eclair/wire/protocol/ChannelTlv.scala	100.00% <100.00%> (ø)
.../acinq/eclair/wire/protocol/InteractiveTxTlv.scala	100.00% <ø> (ø)
...q/eclair/wire/protocol/LightningMessageTypes.scala	98.82% <100.00%> (+0.12%)	⬆️

... and 2 files with indirect coverage changes

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