What are the memory limits on String manipulation ?

Hello everyone!

I'm actually trying to make an export script and I'm facing some limits of Daz DSA Scripts.

Basically the format need to be a single JSON containing various properties and objects, so I retrieve geometry, materials, etc into a single object then "JSON.stringify" it.

The string holding the JSON is actually around 4 Go, that is what "String.length" is reporting : 

    2022-11-09 01:56:18.623 [DEBUG] :: str.length: 4189042444

To save this huge string into a file, i've tried various methods :

1) A single DZFile; but "fwrite" report "0" and the file is empty too, so no contents have been written :

    var fwrite = fp.write(str);

2) Chunk it into multiple 32Kb parts ; but again, fp.write report "0" and the file is still empty :

    var str = "// big json //";

    var size = 32 * 1000;
    var numChunks = Math.ceil(str.length / size);

    var fp = new DzFile(filepath);
    fp.open(DzFile.WriteOnly);

    for (var i = 0, o = 0; i < numChunks; ++i, o += size) {
        var chunk = str.substr(o, size);
        var fwrite = fp.write(chunk);
    }

In this case, RAM is not a problem and i don't care about optimisation, I just want to save this huge string into a file

Is there a limitation in how DAZ handles Strings or file writes ? I'm not sure i've found such information in the documentations.

Thanks for your help!