More txbuilder coverage

[cffls]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.61%. Comparing base (1bc9894) to head (d29a7a6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #472      +/-   ##
==========================================
+ Coverage   89.95%   90.61%   +0.65%     
==========================================
  Files          33       33              
  Lines        5007     5007              
  Branches      758      758              
==========================================
+ Hits         4504     4537      +33     
+ Misses        324      298      -26     
+ Partials      179      172       -7     

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