Fix: Initialize field during construction

[localheinz]

This pull request

• initializes a field during construction

[codecov]

Codecov Report

Merging #611 (5c798a4) into main (f7bfad6) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #611      +/-   ##
============================================
- Coverage     99.02%   99.02%   -0.01%     
+ Complexity      151      150       -1     
============================================
  Files            32       32              
  Lines           514      513       -1     
============================================
- Hits            509      508       -1     
  Misses            5        5              

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

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