fix several bugs

[danielnachun]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 99.77609% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.56%. Comparing base (a992629) to head (ed3f4cb).

Files with missing lines	Patch %	Lines
R/jointEngine.R	93.93%	4 Missing ⚠️
R/tupleSelectors.R	98.27%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #604      +/-   ##
==========================================
- Coverage   98.56%   98.56%   -0.01%     
==========================================
  Files          71       71              
  Lines       33960    34646     +686     
==========================================
+ Hits        33473    34149     +676     
- Misses        487      497      +10     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.