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Update docs/types.rst

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Co-Authored-By: ChrisChinchilla <chriswhward@gmail.com>
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@ -13,7 +13,7 @@ Solidity provides several elementary types which can be combined to form complex
In addition, types can interact with each other in expressions containing
operators. For a quick reference of the various operators, see :ref:`order`.
The concept of "undefined" or "null" values do not exist in Solidity. To handle any unexpected values, you should use the :ref:`revert function<assert-and-require>` to revert the whole transaction.
The concept of "undefined" or "null" values do not exist in Solidity. To handle any unexpected values, you should use the :ref:`revert function<assert-and-require>` to revert the whole transaction, or return a tuple with a second `bool` value denoting success.
.. index:: ! value type, ! type;value