refactor: Enhance cache util perf

[zombieJ]

Move array to map. It's a little hack but valuable.

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/react-component/field-form/4q7k9jh86
✅ Preview: https://field-form-git-perf.react-component.vercel.app

[codecov]

Codecov Report

Merging #256 (6644f70) into master (124fbeb) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #256   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files          13       13           
  Lines         960      965    +5     
  Branches      211      210    -1     
=======================================
+ Hits          959      964    +5     
  Misses          1        1           

Impacted Files	Coverage Δ
src/useForm.ts	99.73% <ø> (ø)
src/utils/NameMap.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 124fbeb...6644f70. Read the comment docs.