Fix #300: Set round_to as an optional argument.

[anevolbap]

Closes issue #300.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.06%. Comparing base (67d9e0e) to head (8c30938).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #301      +/-   ##
==========================================
+ Coverage   76.50%   77.06%   +0.56%     
==========================================
  Files          20       21       +1     
  Lines        1345     1378      +33     
==========================================
+ Hits         1029     1062      +33     
  Misses        316      316              

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