Use the plain JSON.stringify function to encode default values

[cmaster11]

The previous wrapValue function was incomplete, in the sense that strings with e.g. backslashes would be encoded in the wrong way. In the end, looking at the overall behavior of wrapValue, it seems to want to behave exactly in the same way as JSON.stringify, so it may be worth just replacing it once and for all.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (43f2159) 98.69% compared to head (b0d0c4e) 98.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #389      +/-   ##
==========================================
- Coverage   98.69%   98.67%   -0.03%     
==========================================
  Files           9        9              
  Lines         537      528       -9     
  Branches      208      204       -4     
==========================================
- Hits          530      521       -9     
  Misses          7        7              

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[mrjono1]

I must have gone down some rabbit hole of debugging, thanks for this fix