Fix JSON object order comparision with numeric keys

[Firehed]

Fixes #4584, fixes #4674

[codecov[bot]]

Codecov Report

Merging #4675 (aec46c1) into master (638c105) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #4675   +/-   ##
=========================================
  Coverage     83.68%   83.68%           
- Complexity     4944     4945    +1     
=========================================
  Files           389      389           
  Lines         13126    13129    +3     
=========================================
+ Hits          10984    10987    +3     
  Misses         2142     2142           

Impacted Files	Coverage Δ	Complexity Δ
src/Util/Json.php	100.00% <100.00%> (ø)	10.00 <0.00> (+1.00)

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[sebastianbergmann]

I am sorry that it took me so long to review this. Can you please resolve the conflicts and target the 10.5 branch? Thanks!