registerAllFlagsListener returns bizarre data in string response #61
Description
Describe the bug
When the change listener for registerAllFlagsListener is called, it seems to pass a string value with a lot of additional data other than simply the names of changed feature flags. Here is an example of the response I get:
["enableMobileTestFlag": LaunchDarkly.LDChangedFlag(key: "enableMobileTestFlag", oldValue: Optional(1), oldValueSource: Optional(LaunchDarkly.LDFlagValueSource.server), newValue: Optional(0), newValueSource: Optional(LaunchDarkly.LDFlagValueSource.server))]
This whole value is a string response, and hard to parse on the JS side as it isn't even valid JSON. It seems like perhaps the native side representation of this data changed, and what is now getting passed back is essentially gibberish on the JS side.
To reproduce
Set up a change listener and log the response.
Expected behavior
I would expect the response to simply have the shape:
['enableMobileTestFlag']
Or, even more usefully, if the callback was passed the updated values rather than just the keys that have changed, that would be a lot more useful to us.
Logs
If applicable, add any log output related to your problem.
SDK version
3.2.1, the latest
Language version, developer tools
For instance, Go 1.11 or Ruby 2.5.3. If you are using a language that requires a separate compiler, such as C, please include the name and version of the compiler too.
OS/platform
For instance, Ubuntu 16.04, Windows 10, or Android 4.0.3. If your code is running in a browser, please also include the browser type and version.
Additional context
Add any other context about the problem here.