fix(vanilla): improve performance with configurable property on snapshot

[dai-shi]

and some refactors.

close #519 again.

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Name	Status	Preview	Comments	Updated
valtio	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 14, 2023 at 1:53AM (UTC)

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This pull request is automatically built and testable in CodeSandbox.

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Latest deployment of this branch, based on commit 269d75a20c35cfc768143955b987e0d4e9d013ac:

Sandbox	Source
React	Configuration
React Typescript	Configuration
React Browserify	Configuration
React Snowpack	Configuration
React Parcel	Configuration
form-test-jotai	Issue #519
form-test-zustand	Issue #519
form-test-valtio	Issue #519

[github-actions[bot]]

Size Change: +590 B (+1%)

Total Size: 56 kB

Filename	Size	Change
dist/esm/react.js	732 B	+22 B (+3%)
dist/esm/vanilla.js	2.42 kB	+106 B (+5%)	🔍
dist/react.js	668 B	+16 B (+2%)
dist/system/react.development.js	871 B	+20 B (+2%)
dist/system/react.production.js	471 B	+5 B (+1%)
dist/system/vanilla.development.js	2.56 kB	+114 B (+5%)	🔍
dist/system/vanilla.production.js	1.49 kB	+3 B (0%)
dist/umd/react.development.js	812 B	+15 B (+2%)
dist/umd/react.production.js	524 B	+5 B (+1%)
dist/umd/vanilla.development.js	2.71 kB	+111 B (+4%)
dist/umd/vanilla.production.js	1.6 kB	+63 B (+4%)
dist/vanilla.js	2.6 kB	+110 B (+4%)

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `dist/esm/index.js` | 62 B | | `dist/esm/macro.js` | 698 B | | `dist/esm/macro/vite.js` | 864 B | | `dist/esm/react/utils.js` | 221 B | | `dist/esm/utils.js` | 68 B | | `dist/esm/vanilla/utils.js` | 4.21 kB | | `dist/index.js` | 232 B | | `dist/macro.js` | 937 B | | `dist/macro/vite.js` | 1.09 kB | | `dist/react/utils.js` | 237 B | | `dist/system/index.development.js` | 236 B | | `dist/system/index.production.js` | 170 B | | `dist/system/macro.development.js` | 779 B | | `dist/system/macro.production.js` | 556 B | | `dist/system/macro/vite.development.js` | 951 B | | `dist/system/macro/vite.production.js` | 660 B | | `dist/system/react/utils.development.js` | 316 B | | `dist/system/react/utils.production.js` | 221 B | | `dist/system/utils.development.js` | 241 B | | `dist/system/utils.production.js` | 176 B | | `dist/system/vanilla/utils.development.js` | 4.43 kB | | `dist/system/vanilla/utils.production.js` | 2.84 kB | | `dist/umd/index.development.js` | 372 B | | `dist/umd/index.production.js` | 322 B | | `dist/umd/macro.development.js` | 1.05 kB | | `dist/umd/macro.production.js` | 724 B | | `dist/umd/macro/vite.development.js` | 1.23 kB | | `dist/umd/macro/vite.production.js` | 882 B | | `dist/umd/react/utils.development.js` | 396 B | | `dist/umd/react/utils.production.js` | 297 B | | `dist/umd/utils.development.js` | 386 B | | `dist/umd/utils.production.js` | 333 B | | `dist/umd/vanilla/utils.development.js` | 4.7 kB | | `dist/umd/vanilla/utils.production.js` | 2.92 kB | | `dist/utils.js` | 236 B | | `dist/vanilla/utils.js` | 4.54 kB |

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[dai-shi]

Finally fixed! https://codesandbox.io/s/form-test-valtio-forked-85ozhn?file=/src/App.tsx

[dai-shi]

I liked the assert-again-getUntracked idea b/c it would be more black-box and assert what we really care about (compare-proxy isn't making copies)

@stephenh Can you help with the idea of black-box tests? (Open a PR?)

Merging this for now.