/// <summary>
/// Converts to <see cref="FrozenInt32KeyDictionary{TValue}"/>.
/// </summary>
/// <typeparam name="TValue"></typeparam>
/// <param name="source"></param>
/// <param name="keySelector"></param>
/// <param name="valueSelector"></param>
/// <returns></returns>
public static FrozenInt32KeyDictionary <TValue> ToFrozenInt32KeyDictionary <TSource, TValue>(this IEnumerable <TSource> source, Func <TSource, int> keySelector, Func <TSource, TValue> valueSelector)
=> FrozenInt32KeyDictionary <TValue> .Create(source, keySelector, valueSelector);
