IndexedMerkleTree

[Hrom131]

• This PR suggests a bug fix, I've added the necessary tests and the coverage is 100%.
• This PR introduces a new feature, I've discussed the update in an Issue or with the team.
• This PR is just a minor change, like a typo fix.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.89%. Comparing base (5795505) to head (32a5a6a).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #174    +/-   ##
========================================
  Coverage   99.89%   99.89%            
========================================
  Files          56       57     +1     
  Lines        5603     5888   +285     
  Branches     5603     5888   +285     
========================================
+ Hits         5597     5882   +285     
  Partials        6        6            

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[Arvolear]

LGTM!