ArgType defaultValue: 0 returns undefined

[kiastorm]

Describe the bug
A clear and concise description of what the bug is.

Consider the following code

View.argTypes = {
    zoom: {
        defaultValue: 0,
        control: { type: 'number' },
    }
}

If I then log the output of args.zoom in my story, it returns undefined (because it is falsey, I believe)

If I set the defaultValue to 1, when logged it returns 1

To Reproduce
Steps to reproduce the behavior:

1 - Set argType default value to 0
2 - Log output inside story

Expected behavior
A clear and concise description of what you expected to happen.

defaultValue: 0

console.log(args.zoom) // 0

Is this my own error or is it a bug?

[stale]

Hi everyone! Seems like there hasn't been much going on in this issue lately. If there are still questions, comments, or bugs, please feel free to continue the discussion. Unfortunately, we don't have time to get to every issue. We are always open to contributions so please send us a pull request if you would like to help. Inactive issues will be closed after 30 days. Thanks!

[tmeasday]

Ok, I repro-ed this easily and the bug is quite clear on this line:

https://github.com/storybookjs/storybook/blob/60772cbbeb3507831b7f9ce01a2a5e814c03246f/lib/client-api/src/story_store.ts#L460:L460

[shilman]

¡Ay Caramba!! I just released https://github.com/storybookjs/storybook/releases/tag/v6.2.0-alpha.30 containing PR #13919 that references this issue. Upgrade today to the @next NPM tag to try it out!

npx sb upgrade --prerelease

Closing this issue. Please re-open if you think there's still more to do.