perf: improve assign ops/s by 2x

[Kinbaum]

Description

Enhanced the assign function for better performance by replacing Object.entries/reduce with a for-in loop.

This has a 2x improvement on ops/s.

JS Benchmark:

• Before: https://jsbm.dev/hm9b5Y1BEvK1y
• After: https://jsbm.dev/BcEVJMaBlCspX

Checklist

• Changes are covered by tests if behavior has been changed or added
• Tests have 100% coverage
• If code changes were made, the version in package.json has been bumped (matching semver)
• If code changes were made, the yarn build command has been run and to update the cdn directory
• If code changes were made, the documentation (in the /docs directory) has been updated

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Name	Status	Preview	Comments	Updated (UTC)
radash-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 5, 2024 3:12pm

[rd-xx]

This is huge. I'm seeing a 3.6x improvement on M1 Pro 🙌

Such a shame this library is not being maintained anymore