Intent of apply-extends.ts ×3

All 4 exact tests in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=yargs@4153e0f097aeaf43a71a2530db6dda51dff2c544:esm|file=test/ 1 test
- esm/ 1 test
  - mocha:v1|namespace=yargs@4153e0f097aeaf43a71a2530db6dda51dff2c544:esm|file=test/esm/helpers.mjs|title=helpers applyExtends exposes applyExtends helper|occurrence=1 Inherited apply-extends.ts ×2
mocha:v1|namespace=yargs@4153e0f097aeaf43a71a2530db6dda51dff2c544:main|file=test/ 3 tests