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Add _.sortedLastIndex #2106

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Add _.sortedLastIndex #2106

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jridgewell
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Closes #1882.

@jashkenas
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Parity sure — but are there any real-world use cases for this?

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Just _.lastIndexOf supporting binary search.

@jgonggrijp
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I'm favor of having both lower bound and upper bound variants of binary search, but the underlying implementation should take a binary compare predicate instead of a boolean flag that lets you choose only between < and <=.

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_.sortedLastIndex
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@jridgewell @jashkenas @jgonggrijp