client.execute() doesn't respect the discard parameter

[joelfillmore]

Using the following method on the client:

public execute(method: string, params: any, discard: boolean): Promise<any> {
        return this.socket.execute(method, params, discard);
}

When setting discard=true as in the following example:

client.execute('setBandwidthThrottle', {
    "giveInput": {
      "capacity": 0,
      "drainRate": 0
    }
}, true).then(/*something*/)

I get the following error (the id is auto-generated and changes every time):
Error: Expected to get event reply:266995642

When I change discard=false the error goes away.