Add a matrix cleanup for numeric indices
Open
enhancement
good first issue
- Dominant language
- Rust
- Stars
- 114
- Forks
- 85
- Avg merge
- 1d 11h
- Merged PRs (30d)
- 42
Description
It is common to have a matrix like this one from Wikipedia:

In this case and likely many others, the indices are just numbers `11`, `12`, etc., and will be a single `mn` in MathML (e.g., `11`).
The cleanup code should try to find this and convert the `11` to
```
12
```
Note: U+2063 is "invisible separator".
This would improve the speech significantly.
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