public ScopedDictionary(ScopedDictionary <TKey, TValue> previous, IEqualityComparer <TKey> comparer)
{
this.previous = previous;
this.map = new Dictionary <TKey, TValue>(comparer);
}
public ScopedDictionary(ScopedDictionary <TKey, TValue> previous)
: this(previous, EqualityComparer <TKey> .Default)
{
this.previous = previous;
this.map = new Dictionary <TKey, TValue>();
}