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Fix for Collection#slice incorrect offset adjustments for chained negative offsets #202
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…r reversed query (for correct slice with negative offset chaining)
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Existing processing of offset does not account for pre-existing query conditions (such as limit and add_reversed?), thus breaking all cases of chained application of #slice where at least one offset is negative.
Tests for such cases added.
This change can be used as a base for chained #last behavior fix (also broken)