type Collation struct {
	Locale          string `bson:",omitempty"`
	CaseLevel       bool   `bson:",omitempty"`
	CaseFirst       string `bson:",omitempty"`
	Strength        int    `bson:",omitempty"`
	NumericOrdering bool   `bson:",omitempty"`
	Alternate       string `bson:",omitempty"`
	MaxVariable     string `bson:",omitempty"`
	Backwards       bool   `bson:",omitempty"`
}

type CursorType int8

const (
	// NonTailable specifies that a cursor should close after retrieving the last data.
	NonTailable CursorType = iota
	// Tailable specifies that a cursor should not close when the last data is retrieved.
	Tailable
	// TailableAwait specifies that a cursor should not close when the last data is retrieved and
	// that it should block for a certain amount of time for new data before returning no data.
	TailableAwait
)

type FullDocument string

const (
	// Default does not include a document copy
	Default FullDocument = "default"
	// UpdateLookup includes a delta describing the changes to the document and a copy of the entire document that
	// was changed
	UpdateLookup FullDocument = "updateLookup"
)

type ReturnDocument int8

const (
	// Before specifies that findAndUpdate should return the document as it was before the update.
	Before ReturnDocument = iota
	// After specifies that findAndUpdate should return the document as it is after the update.
	After
)