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: circle.go
    path of file: ./repos/sliver/vendor/github.com/jackc/pgx/v5/pgtype
    
    the code of the file until where you have to start completion: package pgtype

import (
	"database/sql/driver"
	"encoding/binary"
	"fmt"
	"math"
	"strconv"
	"strings
    
func (CircleCodec) PlanScan(m *Map, oid uint32, format int16, target any) ScanPlan {
	switch format {
	case BinaryFormatCode:
		switch target.(type) {
		case CircleScanner:
			return scanPlanBinaryCircleToCircleScanner{}
		}
	case TextFormatCode:
		switch target.(type) {
		case CircleScanner:
			return scanPlanTextAnyToCircleScanner{}
		}
	}

	return nil
}