find('\Foo\Bar', $path) vs find('Foo\Bar', $path)

I just noticed that we have an issue in our metadata loading in case a document name is prefixed with a backslash when calling find

// fails
$dm->find('\Foo\Bar', $path);

// works
$dm->find('Foo\Bar', $path);

Should the first work as well?

I have traced the issue to the DriverChain

public function loadMetadataForClass($className, ClassMetadata $class)
{
foreach ($this->drivers as $namespace => $driver) {
if (strpos($className, $namespace) === 0)

}

throw MappingException::classIsNotAValidDocument($className);
}

notice the strpos() does not bother to check if a preceding backslash is in the $className var.