IssueTracker

Currently, for all SharedPreferences, when you try to get a value that isn't a String, you have to provide a default one in case it doesn't exist.

I'd prefer to have null returned instead, and it seems the code behind could actually support it.
For example in the implementation of SharedPreferencesImpl:

    @Override
    public long getLong(String key, long defValue) {
        synchronized (mLock) {
            awaitLoadedLocked();
            Long v = (Long)mMap.get(key);
            return v != null ? v : defValue;
        }
    }

Or the implementation in EncryptedSharedPreferences:

    @Override
    public long getLong(@Nullable String key, long defValue) {
        Object value = getDecryptedObject(key);
        return (value != null && value instanceof Long ? (Long) value : defValue);
    }

So, the "getDecryptedObject" could be null, and if it is null, the default value gets returned.

Please offer nullable result instead.

Maybe call each with "OrNull". Example: getLongOrNull.

Trying to implement this myself would not be atomic:

fun SharedPreferences.getLongOrNull(key:String):Long?{
    if(!this.contains(key))
        return null
    return getLong(key,0)
}

The only good workaround for this would be to save each value as a String and parse from there.