Wrapping an array in a hash adds some mild overhead, but otherwise should work. Unfortunately, for historical reasons, the spec for arrays in BSON is horribly inefficient (index-value pairs!) so I would not recommend it for storing large arrays.
I have been considering supporting a TO_BSON method (or even just using TO_JSON, but don't want to do that until I have a broader think about the general case of mappings to and from BSON. (If you think about how JSON::XS is using Types::Serialiser, you can see the general case problem.)
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