fix: improve compatibility with runtimes not supporting String.prototype.at()

[AllenYu0118]

🔗 Linked issue

Close #101

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Use a more compatible method.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[RazorSiM]

Monkey patched destr with this change and solved my issue with older browsers. Thanks!

[pi0]

Thanks for PR. Seems good compromise to preserve more compat!

MDN support for reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/at#browser_compatibility

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (39f75a1) 100.00% compared to head (a979d72) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #102   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines          100       100           
  Branches        40        40           
=========================================
  Hits           100       100           

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[daniluk4000]

@pi0 is it possible to release new version with this fix? 🙏