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Null.rst

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Null

Ensure that variable has null value assigned

Correct:

assure($x = null, 'null');

Incorect:

assure($x = 1, 'null');
assure($x = false, 'null');
assure($x = true, 'null');
assure($x = '', 'null');
assure($x = [], 'null');

All above values will throw \InvalidArgumentException