Explicitly marking parameters as nullable

[Tigrov]

Q	A
Is bugfix?	✔️/❌
New feature?	❌
Breaks BC?	❌
Fixed issues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.56%. Comparing base (a740d28) to head (3e11874).
Report is 5 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #123      +/-   ##
============================================
+ Coverage     99.55%   99.56%   +0.01%     
  Complexity      162      162              
============================================
  Files            11       11              
  Lines           448      464      +16     
============================================
+ Hits            446      462      +16     
  Misses            2        2              

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