Add docs for allowMultipleNulls option. #4954
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ravage84
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May 5, 2017
en/orm/validation.rst
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| In most SQL databases multi-column ``UNIQUE`` indexes allow multiple null values | ||
| to exist as ``NULL`` is not equal to itself. While, allowing multiple null values is | ||
| the default behavior of CakePHP, you can enable a more strict mode using |
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"Enablling" by setting to false? May be we should rephrase this.
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Refs cakephp/cakephp#10606