creating multiple TOCs can cause id conflicts
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Description
When I was playing with multiple TOCs for #1532 I've noticed, that creating multiple TOCs in conjunction with headings e.g. named "toc2" can create ID conflicts within the document, leading to some parts not being rendered correctly. I assume, that this can only be fixed by adding some sort of HTML ID management system, but nonetheless.
```md
# h1
## toc2
[toc]
## h2
### h3
### toc3
[toc]
#### h4
#### toc4
[toc]
##### h5
###### h6
```
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