Fix: Improve tests for Number

[localheinz]

This PR

• improves tests for Number

[codecov]

Codecov Report

Merging #298 into main will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #298   +/-   ##
=========================================
  Coverage     98.54%   98.54%           
  Complexity      100      100           
=========================================
  Files            23       23           
  Lines           274      274           
=========================================
  Hits            270      270           
  Misses            4        4           

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