refactor(core): use map for batch

[dai-shi]

#2912 was a very good direction as I don't want to have domain knowledge in "batch".

This allows the complete isolation, and feels less hacky.

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commit: dc23b4b

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Size Change: -65 B (-0.07%)

Total Size: 92 kB

Filename	Size	Change
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./dist/system/vanilla.production.js	2.15 kB	-22 B (-1.01%)
./dist/umd/vanilla.development.js	5.69 kB	+6 B (+0.11%)
./dist/umd/vanilla.production.js	2.84 kB	-20 B (-0.7%)
./dist/vanilla.js	5.57 kB	+6 B (+0.11%)

ℹ️ View Unchanged

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[dai-shi]

closing in favor of #2925