stress: utils like lodash / underscore , but smaller

[jokester]

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[codecov]

Codecov Report

Attention: Patch coverage is 51.72414% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 45.81%. Comparing base (97560f0) to head (326cf45).

Files	Patch %	Lines
src/stress/chunk.ts	0.00%	15 Missing ⚠️
src/collection/default-map.ts	12.50%	7 Missing ⚠️
src/collection/iterables.ts	0.00%	5 Missing ⚠️
src/collection/segment-tree.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           canary      #63      +/-   ##
==========================================
- Coverage   48.46%   45.81%   -2.66%     
==========================================
  Files          58       56       -2     
  Lines        1009      919      -90     
  Branches      156      139      -17     
==========================================
- Hits          489      421      -68     
+ Misses        520      498      -22     

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