Client: Add explicit overloads and remove *args arguments

[leszekhanusz]

Should fix issue #292

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (5127e8c) to head (62a7ca2).
⚠️ Report is 171 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #306   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines         2072      2108   +36     
=========================================
+ Hits          2072      2108   +36     

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