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This includes a `size_of` regression for a few DOM types, due to https://github.com/rust-lang/rust/pull/58623 which replaces the implementation of `HashMap` in the standard library to Hashbrown. Although `size_of<HashMap>` grows, it’s not obvious how total memory usage is going to be impacted: Hashbrown only has one `u8` instead of one `usize` of overhead per hash table bucket for storing (part of) a hash, and so might allocate less memory itself. Hashbrown also typically has better run time performance: https://github.com/rust-lang/hashbrown#performance Still, I’ve filed https://github.com/rust-lang/hashbrown/issues/69 about potentially reducing the `size_of<HashMap>` regression.
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nightly-2019-04-25
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