Refactors the library with ChatGPT4

[cpsubrian]

I created this by just pasting in the whole file and asking:

Given the following code, how would you make it better?

The reply was:

Here are some suggestions to improve the given code:

1. Use const and let instead of var for variable declarations.
2. Use arrow functions for more concise syntax.
3. Use the object spread operator instead of Object.keys and forEach when copying properties from one object to another.
4. Use default function parameters to simplify argument handling.
5. Use template literals for string concatenation.
6. Use Set to create a unique list of tags instead of using an array and manually checking for duplicates.

Here's the improved code:

Then I asked:

Can you add helpful comments to your improved code?

This PR is the result.