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firebase - FCM: Message to multiple registration ids limit?

As per this quote I found:

  • registration_ids – Type String array – (Optional) [Recipients of a message] Multiple registration tokens, min 1 max 1000.

Is this the actual limit of device tokens I can send a single message to? And do messages to topics have the same limit?

ex:

{
  "to": [reg_token_01, reg_token_02, ..., reg_token_1000],
  "priority": "high",
  "data": {
    "title": "Hi Peeps!",
    "message": "This is a special message for only for you...  More details are available..."
  }
}

As always, thanks for the info and direction!

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