Improving handling of aborted callbacks

Great idea! I like this solution a lot.

What should the API be?

from dash import Abort
from dash.exceptions import Abort
from dash import Halt
from dash.exceptions import Halt
from dash import PreventUpdate
from dash.exceptions import PreventUpdate

? Any other ideas?

I think I prefer from dash.exceptions import PreventUpdate.

I’d happily accept a PR that does this :+1:

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