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Return the destination from map! when there is nothing to map - #842
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With no elements to process, `map!` returned `nothing` instead of `dest`. `map` of arguments with different lengths goes through `map!` and returned `nothing` too, e.g. `map(+, empty, nonempty)`.
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map!returnednothinginstead ofdestwhen there were no elements to process.mapof arguments with different lengths goes throughmap!, so it returnednothingtoo:I ran into this while fixing #841, which builds on it.