BUG: ArrayManager changes Series.to_frame() from view to copy #42512

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BUG: ArrayManager changes Series.to_frame() from view to copy#42512

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BugCopy / view semantics

ser = pd.Series(range(5))
df = ser.to_frame()

ser._mgr.arrays[0][0] = 10

>>> df.iloc[0, 0]
0   # <-- ArrayManager
10  # <-- BlockManager

cc @jorisvandenbossche

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