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: store.go
    path of file: ./repos/cosmos-sdk/x/gov/migrations/v5
    
    the code of the file until where you have to start completion: package v5

import (
	"context"

	"cosmossdk.io/collections"
	corestoretypes "cosmossdk.io/core/store"
	govv1 "cosmossdk.io/x/gov/types/v1"

	"github.com/cosmos/cosmos-sdk/codec"
)

var (
	// ParamsKey is the key of x/gov params
	ParamsKey = []byte{0x30}
	// ConstitutionKey is the key of x/gov constitution
	ConstitutionKey = collections.NewPrefix(49)
)

// MigrateStore performs in-place store migrations from v4 (v0.47) to v5 (v0.50). The
// migration includes:
//
// Addition of the new proposal expedited parameters that are set to 0 by defau
    
func MigrateStore(ctx context.Context, storeService corestoretypes.KVStoreService, cdc codec.BinaryCodec, constitutionCollection collections.Item[string]) error {
	store := storeService.OpenKVStore(ctx)
	paramsBz, err := store.Get(ParamsKey)
	if err != nil {
		return err
	}

	var params govv1.Params
	err = cdc.Unmarshal(paramsBz, &params)
	if err != nil {
		return err
	}

	defaultParams := govv1.DefaultParams()
	params.ExpeditedMinDeposit = defaultParams.ExpeditedMinDeposit
	params.ExpeditedVotingPeriod = defaultParams.ExpeditedVotingPeriod
	params.ExpeditedThreshold = defaultParams.ExpeditedThreshold
	params.ProposalCancelRatio = defaultParams.ProposalCancelRatio
	params.ProposalCancelDest = defaultParams.ProposalCancelDest
	params.MinDepositRatio = defaultParams.MinDepositRatio

	bz, err := cdc.Marshal(&params)
	if err != nil {
		return err
	}

	if err := store.Set(ParamsKey, bz); err != nil {
		return err
	}

	// Set the default consisitution if it is not set
	if ok, err := constitutionCollection.Has(ctx); !ok || err != nil {
		if err := constitutionCollection.Set(ctx, "This chain has no constitution."); err != nil {
			return err
		}
	}

	return nil
}