Add alternate debug output for listing items in the slab #108
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When debugging output of items in a slab (particularly when a slab is nested in another object that can otherwise just
#[derive(Debug)]), I usually want to see the actual content of the items in the slab, not just its used size and capacity.I made an assumption that the original debug output was intentionally not written to show items, so I added an alternate output instead of replacing the existing implementation. If this is not desired I can update this PR with one that replaces the existing implementation so items are always shown.
Let me know if you have questions. Thanks!