FWIW, I got a private email worrying about unmerged fixes:
This is the list of PR's that have been merged into the develop branch but have not made it into the 1.58 release candidate:
https://github.com/boostorg/serialization/pull/9 https://github.com/boostorg/odeint/pull/7 https://github.com/boostorg/odeint/pull/6 https://github.com/boostorg/pool/pull/7 https://github.com/uBLAS/ublas/pull/26 https://github.com/boostorg/odeint/pull/9 https://github.com/boostorg/odeint/pull/8 https://github.com/boostorg/lexical_cast/pull/10 https://github.com/boostorg/type_traits/pull/11 https://github.com/boostorg/type_index/pull/6
I asked the sender to post this sort of message directly to the list, but with 1.58.0 so close it seemed worthwhile to send the list along. --Beman