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Use a different buffer doubling logic for
std::sys::os::getcwd
Make `std::sys::os::getcwd` call `Vec::reserve(1)` followed by `Vec::set_len` to double the buffer. This is to align with other similar functions, such as: - `std::sys_common::io::read_to_end_uninitialized` - `std::sys::fs::readlink` Also, reduce the initial buffer size from 2048 to 512. The previous size was introduced with 4bc26ce in 2013, but it seems a bit excessive. This is probably because buffer doubling was not implemented back then.
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