Fixed normalization of non-numeric entries

[piotrpospiech]

Not all arguments were trimmed. For example ' 1 ' was changed to '1', but ' a ' was still ' a '.

[codecov-commenter]

Codecov Report

Merging #1 (0626210) into master (8c1d15b) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master        #1   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          164       164           
  Branches        40        40           
=========================================
  Hits           164       164           

Impacted Files	Coverage Δ
index.ts	100.00% <100.00%> (ø)

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