Intertype fixes

[olynch]

Support binary data better, and also nothings.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (bae30a6) 90.90% compared to head (ef50b1a) 90.33%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/intertypes/json.jl	25.00%	3 Missing ⚠️
src/intertypes/julia.jl	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
- Coverage   90.90%   90.33%   -0.57%     
==========================================
  Files          22       22              
  Lines        2055     2060       +5     
==========================================
- Hits         1868     1861       -7     
- Misses        187      199      +12     

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