Deprecate symbolized facts

[bastelfreak]

No description provided.

[bastelfreak]

do we want the backwards-incompatible label here? We already deprecated it in the release summary for 3.0.0: #170

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.06%. Comparing base (50cff16) to head (89161d0).
Report is 12 commits behind head on master.

❗ Current head 89161d0 differs from pull request most recent head dee9b6b

Please upload reports for the commit dee9b6b to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #193      +/-   ##
==========================================
+ Coverage   94.93%   95.06%   +0.12%     
==========================================
  Files           2        2              
  Lines         158      162       +4     
==========================================
+ Hits          150      154       +4     
  Misses          8        8              

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[ekohl]

Thanks for addressing this. Having documentation to refer to is IMHO required for decent adoption.