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: keyvalues.go
    path of file: ./repos/kubeedge/vendor/k8s.io/klog/v2/internal/serialize
    
    the code of the file until where you have to start completion: /*
Copyright 2021 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, softw
    
func MergeKVs(first, second []interface{}) []interface{} {
	maxLength := len(first) + (len(second)+1)/2*2
	if maxLength == 0 {
		// Nothing to do at all.
		return nil
	}

	if len(first) == 0 && len(second)%2 == 0 {
		// Nothing to be overridden, second slice is well-formed
		// and can be used directly.
		return second
	}

	// Determine which keys are in the second slice so that we can skip
	// them when iterating over the first one. The code intentionally
	// favors performance over completeness: we assume that keys are string
	// constants and thus compare equal when the string values are equal. A
	// string constant being overridden by, for example, a fmt.Stringer is
	// not handled.
	overrides := map[interface{}]bool{}
	for i := 0; i < len(second); i += 2 {
		overrides[second[i]] = true
	}
	merged := make([]interface{}, 0, maxLength)
	for i := 0; i+1 < len(first); i += 2 {
		key := first[i]
		if overrides[key] {
			continue
		}
		merged = append(merged, key, first[i+1])
	}
	merged = append(merged, second...)
	if len(merged)%2 != 0 {
		merged = append(merged, missingValue)
	}
	return merged
}