Fix tuple equality with null values

[cmoesel]

Previously, if tuples had the same fields, and at least one field had a null value on one tuple and a non-null value on the other, then:

• if the null/non-null field came after a field with different values, it returned false (which is correct)
• if the null/non-null field came before a field with different values, it returned null (which is incorrect)

Now it will return the correct answer regardless of where the null/non-null field is.

NOTE: This PR does not fix npm audit issues or the codecov issue, as those have already been fixed in #326. As a result, this should be merged after #326.

Submitter:

• This pull request describes why these changes were made
• Code diff has been done and been reviewed (it does not contain: additional white space, not applicable code changes, debug statements, etc.)
• Tests are included and test edge cases
• Tests have been run locally and pass
• Code coverage has not gone down and all code touched or added is covered.
• Code passes lint and prettier (hint: use npm run test:plus to run tests, lint, and prettier)
• All dependent libraries are appropriately updated or have a corresponding PR related to this change - N/A
• cql4browsers.js built with npm run build:browserify if source changed.

Reviewer:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• The tests appropriately test the new code, including edge cases
• You have tried to break the code

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.24%. Comparing base (d37f845) to head (827081d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #327   +/-   ##
=======================================
  Coverage   87.23%   87.24%           
=======================================
  Files          52       52           
  Lines        4537     4538    +1     
  Branches     1279     1279           
=======================================
+ Hits         3958     3959    +1     
  Misses        369      369           
  Partials      210      210           

☔ View full report in Codecov by Sentry.
📢 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.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[hossenlopp]

Looks good and I don't foresee any issues with this after a rebase.

[elsaperelli]

Lgtm!

[hossenlopp]

A few more suggested tests from when I attempted to "break" the code.

[cmoesel]

@hossenlopp - I accepted your suggestions so this is ready for your approval!

[hossenlopp]

👍