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densebitset-unsafe wip

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Original file line number	Diff line number	Diff line change
`@@ -194,7 +194,11 @@ impl<T: Idx> DenseBitSet<T> {`
`194`	`194`	`self.domain_size,`
`195`	`195`	`);`
`196`	`196`	`let (word_index, mask) = word_index_and_mask(elem);`
`197`		`- let word_ref = &mut self.words[word_index];`
	`197`	`+ // SAFETY:`
	`198`	`+ // The number of words we have is the domain size divided by word size (rounded up). We have`
	`199`	`+ // asserted above that the element is contained within the domain size. Therefore,`
	`200`	`+ // word_index is in bounds.`
	`201`	`+ let word_ref = unsafe { self.words.get_unchecked_mut(word_index) };`
`198`	`202`	`let word = *word_ref;`
`199`	`203`	`let new_word = word \| mask;`
`200`	`204`	`*word_ref = new_word;`

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