Kaba class Collection ed

class Collection
    var col: void*

    # constructors
    func mut __init__()

    # functions
    func aggregate(pattern: Any) -> xfer[Result]
    func delete_many(filter: Any)
    func delete_one(filter: Any)
    func find(filter: Any) -> xfer[Result]
    func insert(doc: Any)
    func replace(filter: Any, doc: Any)