Patch failing for byte slices when patching onto struct with nil destination

[valantonini]

I'm getting some unexpected behaviour when diffing and applying the changelog for byte slices. In this example I am comparing 2 structs that have a byte slice and patching the result onto an empty struct that has a nil byte slice. Is this supported behaviour?

Go Playground

package main

import (
	"fmt"

	"github.com/r3labs/diff/v3"
)

type MyType struct {
	MyField []byte
}

func main() {

	left := &MyType{[]byte{208, 72, 51, 52, 175, 134, 76, 84, 143, 38, 99, 184, 128, 24, 107, 163}}
	right := &MyType{[]byte{91, 102, 170, 173, 254, 105, 66, 81, 177, 175, 32, 173, 173, 165, 129, 192}}

	changelog, err := diff.Diff(left, right)
	if err != nil {
		fmt.Println(err)
	}

	dest := &MyType{}
	_ = diff.Patch(changelog, dest)

	fmt.Println(left.MyField)  // [208 72 51 52 175 134 76 84 143 38 99 184 128 24 107 163]
	fmt.Println(right.MyField) // [91 102 170 173 254 105 66 81 177 175 32 173 173 165 129 192]
	fmt.Println(dest.MyField)  // [32 173 173 165 254 192] ?

	// Patchlog errors:

	// [MyField 0] 208 91  Value index 0 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 1] 72 102  Value index 1 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 2] 51 170  Value index 2 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 3] 52 173  Value index 3 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 5] 134 105  Value index 5 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 6] 76 66  Value index 6 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 7] 84 81  Value index 7 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 8] 143 177  Value index 8 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 9] 38 <nil>  Value index 9 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 10] 99 32  Value index 10 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 11] 184 173  Value index 11 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 12] 128 173  Value index 12 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 13] 24 165  Value index 13 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 14] 107 129  Value index 14 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

	// [MyField 15] 163 192  Value index 15 is invalid (cause count 1)
	//  scanning for Value index (cause count 0)

}