bugs fixed with distinct; more tests

[muir]

No description provided.

[codecov-commenter]

Codecov Report

Merging #41 (9b5eebd) into main (d6afd80) will increase coverage by 3.07%.
The diff coverage is 19.23%.

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   44.23%   47.31%   +3.07%     
==========================================
  Files          37       37              
  Lines        3436     3462      +26     
==========================================
+ Hits         1520     1638     +118     
+ Misses       1852     1756      -96     
- Partials       64       68       +4     

Flag	Coverage Δ
go_tests	47.31% <19.23%> (+3.07%)	⬆️

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Impacted Files	Coverage Δ
xopjson/attributes.go	47.96% <12.50%> (+10.16%)	⬆️
xoptest/testlogger.go	51.87% <100.00%> (+8.04%)	⬆️
xopjson/jsonlogger.go	58.44% <0.00%> (+1.16%)	⬆️
basegroup.go	42.39% <0.00%> (+1.84%)	⬆️
xopconst/attributes.go	44.89% <0.00%> (+2.04%)	⬆️
span.go	54.23% <0.00%> (+10.16%)	⬆️

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