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psalm/docs/running_psalm/issues/RawObjectIteration.md

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# RawObjectIteration
Emitted when iterating over an objects properties. This issue exists because it may be undesired behaviour (e.g. you may have meant to iterate over an array)
```php
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<?php
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class A {
/** @var string|null */
public $foo;
/** @var string|null */
public $bar;
}
function takesA(A $a) {
foreach ($a as $property) {}
}
```