fn create_single_series<'a, T, Series>(
grouped_time_log: BTreeMap<impl Into<Option<&'a T>>, Vec<&'a TimeLog>>,
) -> Serieswhere
T: Display + 'a,
Series: SingleSeries,Expand description
Calculate the total hours per key (i.e., User or Milestone) and create a singular Series for
all data points display in a chart. The key of the BTreeMap is Into<Option<T> to allow for
Option<T> and non-Option<T> keys. If it is None, the key is “None”