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Description
Is your feature request related to a problem? Please describe.
In order to delete a key in realtime db you can use either the delete method or send null as the value.
Sending null as a value can be beneficial sometimes because you can use the update method to delete several keys at one request.
Describe the solution you'd like
I would like a solution where None can be passed. Since requests lib does not want to change None values to null json.dumps can be used instead if None value is detected.