https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94674
--- Comment #3 from gcc-bugs at marehr dot dialup.fu-berlin.de --- Thank you for pointing me to this. I find this highly unexpected. There was made a change to `std::type_traits` in C++20 that sets default values, but it does not apply to all iterators? My use case was slightly different, I wanted to extract the `pointer` member type and there is no equivalent like `std::ranges::range_pointer_t` for that. This makes it particularly cumbersome to "forward" properties of an underlying iterator which is used when wrapping it in a new iterator.
