Dowser.
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date_range — the %{"gte" => _, "lte" => _} object form <-> a Date.Range.
Only a field formatted strict_date is cast, since that is the one whose
bounds are dates and nothing more — what a Date.Range holds. Its bounds are
read with Date.from_iso8601/1.
Anything else is returned as it is stored: a field with another format (or
none, which the backend reads as strict_date_optional_time||epoch_millis),
exclusive gt/lt bounds, a bound that isn't a date, and on the way out a
Date.Range whose step isn't 1.
iex> Dowser.Type.DateRange.load(
...> %{"gte" => "2026-08-01", "lte" => "2026-08-11"},
...> %{"type" => "date_range", "format" => "strict_date"}
...> )
Date.range(~D[2026-08-01], ~D[2026-08-11])
iex> Dowser.Type.DateRange.load(
...> %{"gte" => "2026-08-01T00:00:00Z", "lte" => "2026-08-11T00:00:00Z"},
...> %{"type" => "date_range"}
...> )
%{"gte" => "2026-08-01T00:00:00Z", "lte" => "2026-08-11T00:00:00Z"}