Add support for decimals and significant digits

[pelmered]

TODO

• Update readme with examples
• Check the form input tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.48%. Comparing base (08e9971) to head (5d81fd3).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #39      +/-   ##
============================================
+ Coverage     99.45%   99.48%   +0.02%     
- Complexity       45       49       +4     
============================================
  Files            10       10              
  Lines           183      193      +10     
============================================
+ Hits            182      192      +10     
  Misses            1        1              

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