UTF-32 symbols in strings in nested objects in debug mode cause app to crash

Goals

I was remotely debugging JS in React Native app and tried to pass an object to Realm.create with another nested object, one of properties of which is a string, that contains UTF-32 symbol.

Expected Results

I expected nothing.

Actual Results

App crashed.

Steps to Reproduce

I’ve made minimal testcase, which you can find here. App crashes constantly, in 100% of tries.

Code Sample

realm.write(() => {
    realm.create('Item', {
        id: 'test',
        randomName: {
            // String with any UTF-32 symbol with code >= 10000.
            // Strings with U+00009999 and lower are fine, strings with U+00010000 and higher cause crashes.
            otherRandomName: '😊',
        },
    }, true);
});

Version of Realm and Tooling

• Realm JS SDK Version: 2.2.1
• Node or React Native: React Native 0.50.3
• Client OS & Version: Windows 7 x64
• Which debugger for React Native: Chrome DevTools

[kneth]

@lebedev Thank you for investigating. I hope to have some time soon to integrate the patch (or a similar approach).

[kneth]

@angly-cat Thanks for the update. I hope to be able to investigate a bit early next week.