First attempt at allowing decorating of objects with e.g. @output_data(["x"])

[jlnav]

So these fields show up in docs, but won't affect gen_specs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.46%. Comparing base (c7d1cb1) to head (77284b1).
Report is 28 commits behind head on docs/asktell.

Additional details and impacted files

@@               Coverage Diff                @@
##           docs/asktell    #1429      +/-   ##
================================================
- Coverage         91.14%   86.46%   -4.68%     
================================================
  Files                91       91              
  Lines              8343     8363      +20     
  Branches           1486     1490       +4     
================================================
- Hits               7604     7231     -373     
- Misses              538      941     +403     
+ Partials            201      191      -10     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jlnav]

This is probably made redundant/unneeded by the standard requesting that gens explicitly sample over specified variables