Optimize Batch for collection fitting a single bucket #623
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This PR came out of the discussion in #619 but does not address #619. It adds optimisations to
Batchfor collections (and lists) and specifically when a collection can entirely fit in a single bucket. It avoids eagerly allocating to the size argument only to trim down later.This is an optimisation of
Batchand not a defined behaviour./cc @kcragin