Looks interesting! You mentioned in the docs that it would be simpler once abstractions develop and that made me realize it's similar to facebook/dataloader, just used across requests instead of batching up all of the queries per request. It's also of course a generalized form of it that represents batching a parametrized method more so than just batching retrievals by some kind of unique key. It may be able to serve as something to lift API ideas from though. Like some kind of BatchedTask that has an execute() method that takes an array of args then batches those into an array of array of args for the underlying batched implementation.

https://github.com/facebook/dataloader/blob/master/README.md