⚡️ Drop useless internal stream conversions

[dubzzz]

Category:

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

Potential impacts:

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

[codesandbox-ci]

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Latest deployment of this branch, based on commit 293c05f:

Sandbox	Source
Vanilla	Configuration
@fast-check/examples	Configuration

[dubzzz]

Benchmark at https://github.com/dubzzz/fast-check-benchmarks/actions/runs/3924374783

[codecov]

Codecov Report

Merging #3553 (293c05f) into main (078eb14) will decrease coverage by 0.01%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main    #3553      +/-   ##
==========================================
- Coverage   95.47%   95.45%   -0.02%     
==========================================
  Files         213      213              
  Lines        5897     5896       -1     
  Branches     1095     1095              
==========================================
- Hits         5630     5628       -2     
- Misses        267      268       +1     

Flag	Coverage Δ
unit-tests	95.45% <88.88%> (-0.02%)	⬇️
unit-tests-14.x-Linux	?
unit-tests-16.x-Linux	?
unit-tests-18.x-Linux	95.45% <88.88%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...es/fast-check/src/check/runner/utils/PathWalker.ts	94.11% <80.00%> (-0.33%)	⬇️
packages/fast-check/src/check/runner/Runner.ts	95.89% <100.00%> (ø)
packages/fast-check/src/arbitrary/double.ts	97.50% <0.00%> (-2.50%)	⬇️

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