Possibility of configuring characters subset

[skoropadas]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Problem

I want to be able to add/remove characters that should be escaped. I see that you have hard coded values here, so I would like to be able to change them.

Solution

Add the subset option to the list of all options, change the order for option assigning here.

Alternatives

I don't see any alternatives, I was trying to add my own plugin for rehype that escapes some symbols in text using HTML symbols, but it doesn't work because the symbol "&" is always escaped.

[ChristianMurphy]

Welcome @skoropadas 👋

Taking a step back

I want to be able to add/remove characters that should be escaped

Why? Characters need to be escaped to make HTML valid.
Producing invalid HTML seems like a non-goal?

I was trying to add my own plugin for rehype that escapes some symbols in text using HTML symbols, but it doesn't work because the symbol "&" is always escaped.

I'm not sure I follow this, you don't want it to be escaped, so you can escape it anyway?

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Reading between the lines this sounds very similar to past questions where an external platform didn't actually handle HTML correctly or trying to make non-HTML from HTML (recent example: #35)

If it is HTML related, open an issue with the platform for them to handle HTML.
If it is a non-HTML variant, you may want a different renderer or syntax tree.