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Testing schemas

The team fixed the values in their expected DataFrame, but Polars inferred total_checkouts as 64-bit while the pipeline produces 32-bit. The two schemas are printed for you so you can see the mismatch. Fix the expected dtype, then assert the schemas match.

actual, expected, and assert_schema_equal are preloaded.

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100 XP

Cast total_checkouts in expected to pl.Int32.
Assert that the schemas of actual and expected are equal.

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