private ImmutableTree(int hash, TValue value)
{
this.storedHash = hash;
this.leftNode = Empty;
this.rightNode = Empty;
this.storedValue = value;
this.IsEmpty = false;
this.height = 1;
}
private ImmutableTree(int hash, TValue value, ImmutableTree <TValue> left, ImmutableTree <TValue> right)
{
this.storedHash = hash;
this.leftNode = left;
this.rightNode = right;
this.storedValue = value;
this.IsEmpty = false;
this.height = 1 + (left.height > right.height ? left.height : right.height);
}