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Added the following Series aggregation methods: - mode: Returns the most frequent value in a Series - std: Calculates standard deviation with population/sample options - variance: Calculates variance with population/sample options - quantile: Calculates quantile values with interpolation - product: Calculates the product of all values - cumsum: Returns a Series with cumulative sum values - cumprod: Returns a Series with cumulative product values Each method includes comprehensive unit tests covering normal cases, edge cases, and direct function calls.
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Added the following Series aggregation methods:
Each method includes comprehensive unit tests covering normal cases, edge cases, and direct function calls.