Enhancement: Use raw string value internally

[localheinz]

This pull request

• uses the raw string value internally

[codecov]

Codecov Report

Merging #11 (c70d8fe) into main (e13def2) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main       #11   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        22        22           
===========================================
  Files              4         4           
  Lines             67        67           
===========================================
  Hits              67        67           

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

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