[Vuejs]-DRF PATCH method, got all values at type of string in request.data

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solved this by setting null values as empty strings before the patch method and by setting allow_null=True in serializers

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What should I do to get normal values(null as None, integer as int) in request.data?

Either use JSON or use the serializer’s validated data.
HTML forms are sent as strings in the forms of key/value pairs.