Enhancement: Implement Specification

[localheinz]

This pull request

• implements Specification

[codecov]

Codecov Report

Merging #50 (d9eff21) into main (f12b207) will not change coverage.
The diff coverage is 100.00%.

❗ Current head d9eff21 differs from pull request most recent head c939c80. Consider uploading reports for the commit c939c80 to get more accurate results

@@             Coverage Diff             @@
##                main       #50   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        30        33    +3     
===========================================
  Files              4         5    +1     
  Lines             85        93    +8     
===========================================
+ Hits              85        93    +8     

Impacted Files	Coverage Δ
src/Specification.php	100.00% <100.00%> (ø)

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