The same caching context's caching provider can be created twice

This will cause the main cache section to be created twice:
PHP:

\XF::app()->cache('', false, true);
\XF::app()->cache('', false, false);

When using redis of memcache, this means multiple TCP sessions will be created (which may be SSL and require username/password authentication)

This is because of the following code:

PHP:

$key = $context;
if ($doctrineCompatible)
{
    $key .= '_doctrine';
}

$cache = $this->container->create('cache', $key, [
    'doctrineCompatible' =>...

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