Which approach best prevents space leaks when paginating large datasets using OCaml Seq?

Memory Management in Lazy Sequences

When processing large datasets in OCaml 5.x, the Seq module allows for lazy evaluation of potentially infinite sequences. This is often used to implement pagination by combining Seq.drop and Seq.take to isolate specific windows of data without loading the entire set into memory.

The Pagination Constraint

While Seq provides O(1) memory overhead per element during traversal, there is uncertainty regarding memory retention when intermediate consumers or memoized streams hold references to the head of the sequence. In scenarios where a pagination query is repeated or shifted, the risk of space leaks increases if the garbage collector cannot reclaim processed elements.

Does the current implementation of Seq in OCaml 5.x provide a mechanism to ensure that elements preceding the current pagination offset are fully eligible for garbage collection? What is the recommended pattern to avoid accidental memoization when slicing large sequences?