/// <summary>
/// Removes several keys from this key-value map.
/// </summary>
/// <param name="keys">A sequence of keys to remove. Can be much faster if it's a set compatible with this map.</param>
/// <returns></returns>
public override ImmMap <TKey, TValue> RemoveRange(IEnumerable <TKey> keys)
{
keys.CheckNotNull("keys");
var set = keys as ImmSet <TKey>;
if (set != null && _equality.Equals(set.EqualityComparer))
{
return(_root.Except(set.Root, Lineage.Mutable()).WrapMap(_equality));
}
return(base.RemoveRange(keys));
}
protected override ImmSet <T> Except(ImmSet <T> other)
{
return(Root.Except(other.Root, Lineage.Mutable()).Wrap(EqualityComparer));
}