// Remove enclosing parenthesis.
	n := len(values[0])
	r := values[0][1 : n-1]
	// Translate doubled quotes
	*ls = LiteralList(strings.Split(r, ","))
	return nil
}

// ObjectKey is a type for parsed strings occurring in key paths
type ObjectKey struct {
	Lit *LiteralString `parser:" \"[\" @LitString \"]\""`
	ID  *Identifier    `parser:"| \".\" @@"`
}

// QuotedIdentifier is a type for parsed strings that are double
// quoted.