feat: add support for step

[rgimen3z]

Add support for step in number types.

Fixes #132.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.71%. Comparing base (16abe6a) to head (b624c02).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #227      +/-   ##
==========================================
+ Coverage   95.68%   95.71%   +0.03%     
==========================================
  Files          14       14              
  Lines         950      957       +7     
==========================================
+ Hits          909      916       +7     
  Misses         41       41              

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