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: vulnerability_match_exclusion.go
    path of file: ./repos/grype/grype/db/v5
    
    the code of the file until where you have to start completion: package v5

import (
	"encoding/json"
)

// VulnerabilityMatchExclusion represents the minimum data fields necessary to automatically filter certain
// vulnerabilities from match results based on the specified constraints.
type VulnerabilityMatchExclusion struct {
	ID            string                                  `json:"id"`                    // The identifier of the vulnerability
    
func (c *VulnerabilityMatchExclusionConstraint) UnmarshalJSON(data []byte) error {
	// Create a new type from the target type to avoid recursion.
	type _vulnerabilityMatchExclusionConstraint VulnerabilityMatchExclusionConstraint

	// Unmarshal into an instance of the new type.
	var _c _vulnerabilityMatchExclusionConstraint
	if err := json.Unmarshal(data, &_c); err != nil {
		return err
	}

	if err := json.Unmarshal(data, &_c.ExtraFields); err != nil {
		return err
	}

	delete(_c.ExtraFields, "vulnerability")
	delete(_c.ExtraFields, "package")

	if len(_c.ExtraFields) == 0 {
		_c.ExtraFields = nil
	}

	// Cast the new type instance to the original type and assign.
	*c = VulnerabilityMatchExclusionConstraint(_c)
	return nil
}