refactor(core): shave bytes

[dai-shi]

just one byte?

[vercel[bot]]

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Name	Status	Preview	Updated
valtio	✅ Ready (Inspect)	Visit Preview	Sep 2, 2022 at 3:34AM (UTC)

[codesandbox-ci[bot]]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit baaba2b39b484fda0a3b92df34363585ecdeb6d5:

Sandbox	Source
React	Configuration
React Typescript	Configuration
React Browserify	Configuration
React Snowpack	Configuration
React Parcel	Configuration

[github-actions[bot]]

Size Change: -10 B (0%)

Total Size: 48.3 kB

Filename	Size	Change
dist/esm/vanilla.js	1.9 kB	-2 B (0%)
dist/system/vanilla.development.js	2 kB	-1 B (0%)
dist/system/vanilla.production.js	1.25 kB	-2 B (0%)
dist/umd/vanilla.development.js	2.1 kB	-2 B (0%)
dist/umd/vanilla.production.js	1.32 kB	-1 B (0%)
dist/vanilla.js	2.01 kB	-2 B (0%)

ℹ️ View Unchanged

Filename	Size
dist/esm/index.js	712 B
dist/esm/macro.js	613 B
dist/esm/macro/vite.js	697 B
dist/esm/utils.js	3.94 kB
dist/index.js	880 B
dist/macro.js	910 B
dist/macro/vite.js	982 B
dist/system/index.development.js	871 B
dist/system/index.production.js	508 B
dist/system/macro.development.js	721 B
dist/system/macro.production.js	555 B
dist/system/macro/vite.development.js	828 B
dist/system/macro/vite.production.js	653 B
dist/system/utils.development.js	4.15 kB
dist/system/utils.production.js	2.83 kB
dist/umd/index.development.js	1 kB
dist/umd/index.production.js	670 B
dist/umd/macro.development.js	1.06 kB
dist/umd/macro.production.js	766 B
dist/umd/macro/vite.development.js	1.15 kB
dist/umd/macro/vite.production.js	874 B
dist/umd/utils.development.js	4.73 kB
dist/umd/utils.production.js	3.02 kB
dist/utils.js	4.58 kB

_{compressed-size-action}

[dai-shi]

two bytes!