Typed Inttegro domain value.
@type t() :: %Inttegro.PayoutSettingsMutationScheduleSpec{ abide: String.t(), id: String.t(), label: String.t(), t_plus: String.t() }
@spec from_map(map()) :: t()
@spec new!(map() | keyword()) :: t()
@spec to_map(t()) :: map()