refactor: make number input immutable

[xDivisionByZerox]

Created in relation to #328 .

• destruct the input the local scoped variables
• rewrite the test case

[codecov]

Codecov Report

Merging #545 (248acc0) into main (c51fb15) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 248acc0 differs from pull request most recent head 7b7614a. Consider uploading reports for the commit 7b7614a to get more accurate results

@@            Coverage Diff             @@
##             main     #545      +/-   ##
==========================================
- Coverage   99.33%   99.33%   -0.01%     
==========================================
  Files        1920     1920              
  Lines      176488   176443      -45     
  Branches      910      898      -12     
==========================================
- Hits       175310   175264      -46     
- Misses       1122     1123       +1     
  Partials       56       56              

Impacted Files	Coverage Δ
src/datatype.ts	99.66% <100.00%> (-0.01%)	⬇️
src/vendor/unique.ts	93.54% <0.00%> (-1.62%)	⬇️
src/image_providers/lorempicsum.ts	93.96% <0.00%> (-0.48%)	⬇️
src/image_providers/lorempixel.ts	91.75% <0.00%> (-0.23%)	⬇️
src/system.ts	96.37% <0.00%> (-0.11%)	⬇️
src/image_providers/unsplash.ts	98.66% <0.00%> (-0.06%)	⬇️
src/random.ts	99.22% <0.00%> (-0.01%)	⬇️
src/date.ts	100.00% <0.00%> (ø)
src/iban.ts	100.00% <0.00%> (ø)
src/definitions/utils.ts	100.00% <0.00%> (ø)
... and 2 more