fix: Fix breaking change by making the previous change Nullable/Optional

[Abhi347]

Fix the breaking change introduced in #230
The change to long from int is not reverted here, as that's what we want to do and will continue to do it unless we get rid of the ints everywhere.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.73%. Comparing base (9493ca9) to head (1520387).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #231   +/-   ##
=========================================
  Coverage     76.73%   76.73%           
  Complexity      433      433           
=========================================
  Files            60       60           
  Lines          1380     1380           
  Branches         60       60           
=========================================
  Hits           1059     1059           
  Misses          277      277           
  Partials         44       44           

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