⚡️ Faster generate for constant and constantFrom

[dubzzz]

Improve performance of the generate method on constants arbitraries. The custom get value of NextValue constructor was adding an extra cost to the generate cost.

From my measurements, improvements are significants:

Property(fc.constant('a')) on fast-check@2.14.0 x 6,653 ops/sec ±0.60% (91 runs sampled)
Property(fc.constant('a')) on fast-check@2.15.0 x 2,290 ops/sec ±3.02% (80 runs sampled)
Property(fc.constant('a')) on fast-check@99.99.99 x 3,374 ops/sec ±3.76% (82 runs sampled)

99.99.99 is master + the change

Category:

• ✨ Introduce new features
• 📝 Add or update documentation
• ✅ Add or update tests
• 🐛 Fix a bug
• 🏷️ Add or update types
• Other(s): Performances

Potential impacts:

• Generated values
• Shrink values
• Performance
• Typings
• Other(s): ...

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[codecov]

Codecov Report

Merging #1945 (d4d9a02) into main (dbe625b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1945   +/-   ##
=======================================
  Coverage   97.49%   97.49%           
=======================================
  Files         166      166           
  Lines        4117     4118    +1     
  Branches      799      800    +1     
=======================================
+ Hits         4014     4015    +1     
  Misses         99       99           
  Partials        4        4           

Flag	Coverage Δ
unit-tests	97.49% <100.00%> (+<0.01%)	⬆️
unit-tests-10.x-Linux	97.49% <100.00%> (+<0.01%)	⬆️
unit-tests-12.x-Linux	97.49% <100.00%> (+<0.01%)	⬆️
unit-tests-14.x-Linux	97.49% <100.00%> (+<0.01%)	⬆️
unit-tests-16.x-Linux	97.49% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
src/arbitrary/_internals/ConstantArbitrary.ts	100.00% <100.00%> (ø)

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