Stable.V1val create :
data:('k * 'v) Opaque_map.t ->
num_filtered_rows:int ->
key_range:'k Collate_params.Which_range.t ->
rank_range:int Collate_params.Which_range.t ->
num_before_range:int ->
num_unfiltered_rows:int ->
('k, 'v) Stable.V1.t @@ portable