refactor(vanilla): simplify handling object descriptor

[dai-shi]

Thought this would be more consistent with https://github.com/pmndrs/valtio/pull/653#issuecomment-1416911665.

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valtio	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 6, 2023 at 1:57AM (UTC)

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Size Change: -71 B (0%)

Total Size: 55.3 kB

Filename	Size	Change
dist/esm/vanilla.js	2.28 kB	-8 B (0%)
dist/system/vanilla.development.js	2.42 kB	-3 B (0%)
dist/system/vanilla.production.js	1.45 kB	-10 B (-1%)
dist/umd/vanilla.development.js	2.58 kB	-20 B (-1%)
dist/umd/vanilla.production.js	1.52 kB	-11 B (-1%)
dist/vanilla.js	2.47 kB	-19 B (-1%)

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.js` | 710 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.js` | 652 B | | `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.development.js` | 851 B | | `dist/system/react.production.js` | 466 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.development.js` | 797 B | | `dist/umd/react.production.js` | 519 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]

@stephenh Would you review this please?

[dai-shi]

Small disclaimer I am still in the "barely following along" stage of understanding and not "ah I immediately see why this is better" stage. :-)

Sure, totally fine. (And, there are only few who barely follow along.)