[Feature Request]: Expose buffer index

[Egan Schafer]

What?

expose the get_current_element_index function
add index to get_elements

Why?

I imagine there are many potential usages, but I'm trying to setup a custom buffer close keybind.
I can submit a pull request if you'd like, but it's an easy enough feature.

[Akin]

Tbh my preference is generally to avoid exposing things where possible since people then depend on the API working a certain way which ends up tying my hands for future changes or deprecations. This isn't one that I'm particularly keen on but if you raise the PR 🤷🏾‍♂️