You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: set.go
    path of file: ./repos/terraform/internal/dag
    
    the code of the file until where you have to start completion: // Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

package dag

// Set is a set data structure.
type Set map[interface{}]interface{}

// Hashable is the interface used by set to get the hash code of a value.
// If this isn't given, then the value of the item being add
    
func (s Set) Intersection(other Set) Set {
	result := make(Set)
	if s == nil || other == nil {
		return result
	}
	// Iteration over a smaller set has better performance.
	if other.Len() < s.Len() {
		s, other = other, s
	}
	for _, v := range s {
		if other.Include(v) {
			result.Add(v)
		}
	}
	return result
}