image/gif: image bounds obtained by image.Decode and gif.Decode are different

[pic4xiu]

What version of Go are you using (go version)?

❯ go version
go version go1.20.4 darwin/arm64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

macOS arm64

should have no effect

What did you do?

https://go.dev/play/p/f0RmDYbQALy

What did you expect to see?

outputs nothing because I want got and want to be the same

What did you see instead?

❯ go run main.go
(0,0)-(10,10) (48,0)-(58,10)

[randall77]

This is done intentionally here: https://cs.opensource.google/go/go/+/refs/tags/go1.20.6:src/image/gif/writer.go;l=462
CL that checked in that code: https://go-review.googlesource.com/c/go/+/9712
@nigeltao

[aimuz]

https://go.dev/play/p/CxdAlI5Yk62

In this way you will get consistent values