Word delimiters, discussable:

If I have the cursor in the middle of a word, ie this repo|sitory should, does this deletes the full word (and I end up with this |should) or just the part of the word before the cursor (ending up with this |sitory should) ?

On Android it's the last one, which seems more intuitive but perhaps also less useful?

It deletes the full word (between delimiters) under the cursor.
And deletes an extra space, if needed.

I also feel deleting just the part before the cursor is more intuitive, at least what I would expect.
But given how hard it is to precisely position the cursor with our fat fingers, deleting the full word might be fine, once we are used to that behaviour.

And deletes an extra space, if needed.

You mean the cursor is at the immediate end of the previous word, and I need to input a space before typing my new word?
I would expect to not have to type that space, but may be this behaviour is needed to a new backspace swipe can delete another previous word, and we can easily do that in sequence?

may be this behaviour is needed to a new backspace swipe can delete another previous word, and we can easily do that in sequence?

Yes, I thought it was convenient.

So would we rather only left of cursor or whole word?

Added dashes as word delimiters.
Swipe west deletes part of the word left to cursor.
Swipe north deletes the whole word.

Just to be clear, we now have FOUR backspaces?

1. Just tap backspace to delete a character.
2. Long-tap to delete a whole line
3. Swipe west to delete a part of the word until a dash
4. Swipe north to delete a whole word.

Shouldn't it be easier if (1) stays, but 2-4 are put into a popup menu that opens with a long tap?

I don't know, it's roughly the same as on most other mobile keyboards. :-)

I don't think we've implemented ctrl+backspace on keyboard yet.