flag: print default value when false for boolean flags

[Rajan-226]

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

$ go version go1.21.0 darwin/arm64

Does this issue reproduce with the latest release?

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

go env Output

$ go env

What did you do?

I defined a boolean flag with default value as false.

flag.Bool("boolVar", false, "Trying bool variable")

I'm running go run main.go -h

What did you expect to see?

I expect to get default value of boolVar like I get when it's true.

What did you see instead?

I'm not getting default value when it's false.

[Rajan-226]

I would like to pick dev for this if you consider it as a good first issue.

[seankhliao]

sure, send a CL / PR

[ianlancetaylor]

Please always post ordinary text output as plain text, not as an image. Plain text is much easier to read. Thanks.

[ianlancetaylor]

This is intentional behavior. The flag package only displays the default flag when that value is not the zero value of the type. The code is at https://go.googlesource.com/go/+/refs/heads/master/src/flag/flag.go#628. Thanks for reporting this but we don't plan to change it.