[ios/native] Dictionary with stringified integer keys misconverted as sparse array when converting to JS

[jaredly]

Have you read the Contributing Guidelines?

Yes

Environment

1. react-native -v: 0.46

Then, specify:

• Target Platform: iOS
• Development Operating System: macOS
• Build tools: Xcode

Steps to Reproduce

1. in swift, pass these props to a new react RCTRootView

		let props = [
			"awesome": ["2003": 85.71428571428571, "3002": 28.57142857142857, "3001": 52.38095238095239] as [String: Any],
		] as [String : Any]

		return RCTRootView(
			bridge: bridge,
			moduleName: "Topic",
			initialProperties: props as [NSObject : AnyObject]
		)

2. run, looking at the logs

Expected Behavior

The logs would say

2017-08-21 13:41:07.290 [info][tid:main][RCTRootView.m:302] Running application Topic ({
    initialProps =     {
        awesome =         {
            2003 = "85.71428571428571";
            2500 = "28.57142857142857";
            3001 = "52.38095238095239";
        };
    };
    rootTag = 31;
})

2017-08-21 13:25:01.785 [info][tid:com.facebook.react.JavaScript] Running application "Topic" with appParams: {"rootTag":31,"initialProps":{"awesome":{"2003":85.71428571428571,"3001":52.38095238095239,"3002":28.57142857142857}}}. __DEV__ === true, development-level warning are ON, performance optimizations are OFF

Actual Behavior

2017-08-21 13:41:07.290 [info][tid:main][RCTRootView.m:302] Running application Topic ({
    initialProps =     {
        awesome =         {
            2003 = "85.71428571428571";
            2500 = "28.57142857142857";
            3001 = "52.38095238095239";
        };
    };
    rootTag = 31;
})

2017-08-21 13:25:01.785 [info][tid:com.facebook.react.JavaScript] Running application "Topic" with appParams: 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__DEV__ === true, development-level warning are ON, performance optimizations are OFF

Reproducible Demo

(see included code)

Other notes

• having the values be Doubles seems important -- when I tried setting the values to 0, it didn't trigger the bug
• need to have at least 3 keys, (1 or 2 didn't trigger it), and they don't need to be consecutive
• adding a non-integer key didn't make a difference (e.g. "extra": 333.222)
• The log the comes from native doesn't exhibit the problem, but the log from the js side does. So it's a "convert native value to js" issue

[sophiebits]

Maybe caused by JSC's built-in serialization? https://github.com/facebook/react-native/blob/master/React/Executors/RCTJSCExecutor.mm#L587-L591 :o

[pull-bot]

@facebook-github-bot no-template

[pull-bot]

@facebook-github-bot no-template

[facebook-github-bot]

Hey, thanks for reporting this issue! It looks like your description is missing some necessary information, or the list of reproduction steps is not complete. Can you please add all the details specified in the Issue Template? This is necessary for people to be able to understand and reproduce the issue being reported. I am going to close this, but feel free to open a new issue with the additional information provided. Thanks! See "What to Expect from Maintainers" to learn more.

[facebook-github-bot]

Hey, thanks for reporting this issue! It looks like your description is missing some necessary information, or the list of reproduction steps is not complete. Can you please add all the details specified in the Issue Template? This is necessary for people to be able to understand and reproduce the issue being reported. I am going to close this, but feel free to open a new issue with the additional information provided. Thanks! See "What to Expect from Maintainers" to learn more.

[jaredly]

Oh c'mon. One hour to fix an issue or you close?

[jaredly]

yo @sophiebits could you reopen for me?

[sophiebits]

Not sure what happened here. (I doubt this was a one-hour thing; rather maybe a buggy script that didn't close the first time? Not sure.)

[sophiebits]

cc @hramos for "what is this script and why did it close this issue that did use a template?"

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Maybe the issue has been fixed in a recent release, or perhaps it is not affecting a lot of people. If you think this issue should definitely remain open, please let us know why. Thank you for your contributions.

[hramos]

Not sure what happened back on October but looks like it incorrectly closed the issue. Reopening (though StaleBot will re-close after two months of inactivity, again).

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Maybe the issue has been fixed in a recent release, or perhaps it is not affecting a lot of people. If you think this issue should definitely remain open, please let us know why. Thank you for your contributions.