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Related to PR #114423, this PR proposes to unify the naming of the internal pointer members in `std::vector` and `std::__split_buffer` for consistency and clarity. Both `std::vector` and `std::__split_buffer` originally used a `__compressed_pair<pointer, allocator_type>` member named `__end_cap_` to store an internal capacity pointer and an allocator. However, inconsistent naming changes have been made in both classes: - `std::vector` now uses `__cap_` and `__alloc_` for its internal pointer and allocator members. - In contrast, `std::__split_buffer` retains the name `__end_cap_` for the capacity pointer, along with `__alloc_`. This inconsistency between the names `__cap_` and `__end_cap_` has caused confusions (especially to myself when I was working on both classes). I suggest unifying these names by renaming `__end_cap_` to `__cap_` in `std::__split_buffer`.