Unable to use useCursor false in aggregate

[nalscher]

I can't do this :

$collection->aggregate($pipeline, [
'useCursor' => false,
]);

i have always the error :
"typeMap" option should not be used if "useCursor" is false

even if i do this :
$collection->aggregate($pipeline, [
'useCursor' => false,
'typeMap' => null
]);

or
$database->selectCollection('calls', [
'typeMap' => null
]);

i think it's due to :
Collection.php line 112 : $this->typeMap = isset($options['typeMap']) ? $options['typeMap'] : self::$defaultTypeMap;
and in the same file line 163 :
if ( ! isset($options['typeMap'])) {
$options['typeMap'] = $this->typeMap;
}

we always have a value in typeMap, the default or the custom one but never null

[alcaeus]

See #107.

[nalscher]

Ok it's redundant with #107.
Maybe you can accept the pull request to have the correction ?