Testing new preserve argument in tax_agg

[codecov-commenter]

Codecov Report

Merging #75 (088f37b) into main (71dba6f) will decrease coverage by 0.08%. The diff coverage is 14.28%.

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
- Coverage   72.46%   72.37%   -0.09%     
==========================================
  Files          68       68              
  Lines        4580     4587       +7     
==========================================
+ Hits         3319     3320       +1     
- Misses       1261     1267       +6     

Impacted Files	Coverage Δ
R/tax_agg.R	90.65% <14.28%> (-5.35%)	:arrow_down:

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[david-barnett]

Change & unique to & lower, for generalisability

[david-barnett]

Add example