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DOC: add sections about big new features (CoW, string dtype) to 3.0.0 whatsnew notes #61724

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jorisvandenbossche
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We don't actually yet list the bigger features (string dtype, CoW, no silent downcasting) in the 3.0.0 whatsnew page, so starting to do that here.

Already pushed a section about string dtype, will further add a section about CoW and the downcasting.

how pandas operates with respect to copies and views. A summary of the changes:

1. The result of *any* indexing operation (subsetting a DataFrame or Series in any way,
i.e. including accessing a DataFrame column as a Series) or any method returning a
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i.e. including accessing a DataFrame column as a Series) or any method returning a
e.g. accessing a DataFrame column as a Series) or any method returning a

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I am going to keep the current wording here because I specifically wanted to highlight that accessing a column is also an indexing operation (people might think first about selecting rows, boolean filtering etc, but accessing a column is probably the most common (and most affected) case)

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This pull request is stale because it has been open for thirty days with no activity. Please update and respond to this comment if you're still interested in working on this.

@github-actions github-actions bot added the Stale label Aug 15, 2025
@jorisvandenbossche
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Going to merge this to have something in the docs, we can always further refine it so more feedback is certainly welcome!

@jorisvandenbossche jorisvandenbossche merged commit 1bd75cc into pandas-dev:main Aug 15, 2025
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@jorisvandenbossche jorisvandenbossche deleted the doc-whatsnew-3.0 branch August 15, 2025 11:42
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