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+Removed: The rarely used long double variants `std_cxx17::legendrel` and
+`std_cxx17::cyl_bessel_jl` have been removed due to a compatibility issue
+with boost-1.83. If you happen to use these functions in your project
+you can change to using `std::legendrel` and `std::cyl_bessel_jl` directly,
+which are provided by the C++ standard template library.
+<br>
+(Matthias Maier, 2024/01/08)