List and Dict are good for different things:
If most of the interaction with the collection is getting and setting, adding
and deleting items 1 at a time: go with Dict.
If most of the interaction is going over the list, including sorting,
rendering, counting items etc: then go with List.
Todo's in the example at more or less in the middle. List is simpler, so that
would most sense.
Not sure what you mean with:
" Maybe.map doesn't appear useful as record updates aren't compose-able?)"
I think you can do something like:
{ model | myCollection = Dict.update key (Maybe.map <| itemUpdate newText)
model.myCollection }
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