Does cancelling an image download task cache the current download progress?

[andyau-crunchyroll]

If I start retrieving an image, cancel before the download is finished, and retrieve it a second time at a later time, does KingFisher download the image from scratch or is partial progress preserved?

Context:
In a tvOS collection view, when a cell is focused, we download an image for said cell and display it as a background, canceling any previous in progress download task. I am mainly curious if partial caching is an optimization that is already happening or if I need to let the download task complete to cache the image.

[onevcat]

It starts the downloading from the beginning. There is no such partial caching for downloading tasks.