Add section on std::unreachable.

Include std::expected.

Fix broken example for monadic std::optional.

Adjust link title for range-based for safety.

Add section for monadic std::optional operations.

Add section for inout/out pointers.

Add section for spanstream.

Add std::to_underlying.

contains for strings and string views

Ass the stacktrace library.

Add section on range-based for loop safety.

Add multidimensional subscript operator.

Change license date to 2026.

Correct std::chrono::abs (#142)

Fix function call in constinit section. (#141)