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Fixed issue where the :class:`.JSON` type had a read-only :attr:`.JSON.should_evaluate_none` attribute, which would cause failures when making use of the :meth:`.TypeEngine.evaluates_none` method in conjunction with this type. Pull request courtesy Sanjana S. Fixes: #4485 Closes: #4496 Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/4496 Pull-request-sha:044beb2398Change-Id: I1f3e1d7dec9d2ceb6ccaaa8cac158a062cf02710 (cherry picked from commit12dad561a7)