fix: format numeric result

[JimmyDaddy]

fixed #250

[codecov-commenter]

Codecov Report

Merging #253 (052d5a9) into master (a5c90b3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #253   +/-   ##
=======================================
  Coverage   97.32%   97.32%           
=======================================
  Files          43       44    +1     
  Lines        3135     3141    +6     
=======================================
+ Hits         3051     3057    +6     
  Misses         84       84           

Impacted Files	Coverage Δ
src/collection.js	100.00% <100.00%> (ø)
src/contants.js	100.00% <100.00%> (ø)
src/spell.js	95.17% <100.00%> (ø)

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