* PR needed while some PRs are not merged and released on upstream. :}
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*
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* @method AssertionChain empty(string|callable $message = null, string $propertyPath = null, string $encoding = 'utf8') Assert that string is empty.
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* @method AssertionChain maxCount(int $count, string $message = null, string $propertyPath = null) Assert that the countable does not have more than $count elements.
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* @method AssertionChain minCount(int $count, string $message = null, string $propertyPath = null) Assert that the countable has at least $count elements.
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* @method AssertionChain notContains(string $needle, string|callable $message = null, string $propertyPath = null, string $encoding = 'utf8') Assert that string does not contains a sequence of chars.
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* @method AssertionChain isCountable(string|callable $message = null, string $propertyPath = null) Assert that value is countable.