messaging.sendMulticast does not send FcmOptions

[stari4ek]

[READ] Step 1: Are you in the right place?

yep

[REQUIRED] Step 2: Describe your environment

• Operating System version: Linux 7u 5.3.0-23-generic Loading the API key from a local file instead of a command-line arg #25-Ubuntu SMP Tue Nov 12 09:22:33 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
• Firebase SDK version: 8.8.0
• Firebase Product: messaging
• Node.js version: 12.4.0
• NPM version: 6.13.1

[REQUIRED] Step 3: Describe the problem

messaging.sendMulticast does not send FcmOptions. sendAll works well

Steps to reproduce:

messaging.sendMulticast

Relevant Code:

this is current implementation of sendMulticast:

        var messages = copy.tokens.map(function (token) {
            return {
                token: token,
                android: copy.android,
                apns: copy.apns,
                data: copy.data,
                notification: copy.notification,
                webpush: copy.webpush,
            };
        });
        return this.sendAll(messages, dryRun);

which obviously does not copy fcmOptions property from original message