Allow the sandbox decoder to drop messages

[trink]

a return of -2 like the encoder

[mattbostock]

What happens currently; could a failure to decode a message cause the plugin channel to fill up?

[trink]

No, currently you have to return success or failure.

However, in cases like de-duping you really don't want to count/log that as a decode failure just to drop the message and you probably don't want to pass it through to the router with a 'dupe' flag only to be ignored down stream.

[kipras]

Any progress on this? This would be really helpful, because dropping messages after decoding is necessary sometimes.

[pasha-kuznetsov]

+1