LastMetadataId key

[giorgionocera]

In the nft module, why do we use both CollId and LastMetadataId as values in the store?

info := types.LastMetadataIdInfo {
	CollId:         collId,
	LastMetadataId: id,
}

Since we are using the CollID as the key, why don't we use only the LastMetadataId as the value?

go-bitsong/x/nft/keeper/metadata.go

Lines 36 to 44 in afcba32

	func (k Keeper) SetLastMetadataId(ctx sdk.Context, collId, id uint64) {
	info := types.LastMetadataIdInfo{
	CollId: collId,
	LastMetadataId: id,
	}
	bz := k.cdc.MustMarshal(&info)
	store := ctx.KVStore(k.storeKey)
	store.Set(types.LastMetadataId(collId), bz)
	}