Stream the key/value-pairs of a judy array, dumping it to a file.
In the judy library the functions
keys :: JudyImmutable a -> IO [Key]
elems :: JE a => JudyImmutable a -> IO [a]
toList :: JE a => JudyImmutable a -> IO [(Key, a)] return lists, which can use quite a lot of memory. This is problematic when the array is big. It makes much more sense to stream a judy array into an arbitrary data structure. This way much bigger judy arrays can be loaded from/stored into a file, which is also in my use case faster than the construction of the judy array and reduces startup time.
Instead of adding these functions to judy or streamly, we make a new library to not force new dependencies on either of the two.