Fix: Allow zero as value for Number\Exact

[localheinz]

This PR

• allows 0 as value for Number\Exact

[codecov]

Codecov Report

Merging #277 into main will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main     #277   +/-   ##
=========================================
  Coverage     98.40%   98.40%           
  Complexity       98       98           
=========================================
  Files            21       21           
  Lines           251      251           
=========================================
  Hits            247      247           
  Misses            4        4           

Impacted Files	Coverage Δ	Complexity Δ
src/Number/Exact.php	100.00% <100.00%> (ø)	3.00 <0.00> (ø)

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