BUG: Correct length_of_indexer for range objects #63872
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`length_of_indexer` computed the length of `range` objects using a manual arithmetic formula, which produced incorrect results for valid ranges. This PR replaces that calculation with `len(indexer)` and adds a regression test to ensure correct behavior.
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length_of_indexercomputed the length ofrangeobjects using a manual arithmetic formula, which produced incorrect results for valid ranges.This PR replaces that calculation with
len(indexer)and adds a regression test to ensure correct behavior.