The geocoder autocomplete requests are billed as geocoding requests.
We use a combination of Pelias and Nominatim geocoder engine to provide you the best results.
The goal of autocomplete end-point is to provide fast and misspelling-tolerant address suggestions, that can be reviewed by a human. The forward geocoding search tries to return results corresponding the most. This can take more time and be slower.
We release a new version for bug-fixes, to support new functionality on libraries update. However the libraries are open source, so you are welcome to create a pull request on GitHub.