Add getextra with default

[bvdmitri]

A simple PR that adds a new method for getextra with default

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.49%. Comparing base (54eb171) to head (db172d4).
Report is 1 commits behind head on dev-4.0.0.

❗ Current head db172d4 differs from pull request most recent head b225c30. Consider uploading reports for the commit b225c30 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##           dev-4.0.0     #182      +/-   ##
=============================================
- Coverage      91.85%   91.49%   -0.37%     
=============================================
  Files             15       15              
  Lines           1842     1775      -67     
=============================================
- Hits            1692     1624      -68     
- Misses           150      151       +1     

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