lower case currency is valid

[edasubert]

I think "eur" should be accepted as a currency and stored as "EUR" just like basically any date in a string is accepted as (and converted to) a datetime object

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e186814) to head (21c1a67).
Report is 53 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #236    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           11        19     +8     
  Lines          685      1049   +364     
  Branches       169       253    +84     
==========================================
+ Hits           685      1049   +364     

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