09c497f744
In #14567 I claimed that the underlying allocation is reused. And it was. At the time I've submitted a PR I was using `.filter_map(|x| x)`, which got flagged by clippy as something that could be simplified to `.flatten()` - that however broke the allocation reuse promise. Thus, this PR goes back to using `filter_map` and additionally in debug builds it performs checks for allocation reuse. With .flatten in place, a bunch of unit test fail on that branch, so the checks do work. Release Notes: - N/A |
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