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_array_to_attr() in Asset library
As of the current release, If the attrs key is used with js() for example, attributes are added with no gap at the end eg:
js('script', NULL, array('output' => 'whitespace', 'attrs' => array('async' => 'async')));
Note no whitespace between "async" & type=
I think Asset.php line 1523 just needs a trailing space added?