WIP: Data in json_value now a polymorphic class

[jacobwilliams]

trafficstars

Fixes #405

[codecov-io]

Codecov Report

Merging #412 into master will increase coverage by 0.17%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
+ Coverage   89.52%   89.70%   +0.17%     
==========================================
  Files           3        3              
  Lines        5336     5360      +24     
==========================================
+ Hits         4777     4808      +31     
+ Misses        559      552       -7     

[codecov-commenter]

Codecov Report

Merging #412 into master will increase coverage by 0.17%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
+ Coverage   89.96%   90.13%   +0.17%     
==========================================
  Files           6        6              
  Lines        5270     5294      +24     
==========================================
+ Hits         4741     4772      +31     
+ Misses        529      522       -7