Checklist

• I have verified that that issue exists against the master branch of Django REST framework.
• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• This is not a usage question. (Those should be directed to the discussion group instead.)
• This cannot be dealt with as a third party library. (We prefer new functionality to be in the form of third party libraries where possible.)
• I have reduced the issue to the simplest possible case.
• I have included a failing test as a pull request. (If you are unable to do so we can still accept the issue.)

Steps to reproduce

from rest_framework import serializers

class TestSerializer(serializers.Serializer):
    json = serializers.JSONField()

s = TestSerializer(data={'json': "{broken JSON"})
assert s.is_valid() is False

Expected behavior

Invalid JSON should result in is_valid() returning False.

Actual behavior

is_valid() returns True

Specifying binary=True for the field definition results in the desired behavior for serialization, but causes deserialization to fail on Python 3.