Create a BSON document from an arbitrary value. Recursively converts the internal structure of arrays, tuples, structs, etc.

Convert the given bson document or value to the specified type, recursively converting arrays, tuples, dicts and sub-documents according to the same structure produced by Mongoc.BSON(value::Any)

Get the types from a union type. https://stackoverflow.com/a/43305886/1133481