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String dtype: allow string dtype for non-raw apply with numba engine #59854

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#55104 enabled using numba with raw=False in apply() (BTW, this seems rather undocumented?), but that PR had some specific hack for object dtype index. Extending that hack to also convert str dtype index to numpy strings under the hood (this might hurt performance, but for now just want to get this working)

xref #54792

@jorisvandenbossche jorisvandenbossche added Strings String extension data type and string data Apply Apply, Aggregate, Transform, Map numba numba-accelerated operations labels Sep 20, 2024
@jorisvandenbossche jorisvandenbossche added this to the 2.3 milestone Sep 20, 2024
@jorisvandenbossche jorisvandenbossche marked this pull request as ready for review September 21, 2024 08:38
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