https://github.com/simd-everywhere/simde has done their first release ( https://simd-everywhere.github.io/blog/announcements/release/2020/06/21/0.5.0-release.html ) and it seems like something potentially useful for merging code paths. The most likely candidate I imagine is using SIMD code to replace the non-SIMD fallback path, but maybe it'd be worth checking if it can be used to merge ARM and x8

The current testCaseStarting and testCaseEnding events can (and usually do) fire multiple times for a single TEST_CASE. This is because they fire every time TEST_CASE is entered/left, which happens multiple times when there are SECTIONs inside it. We want to provide reporter member function that is called when a TEST_CASE is about to be entered the first time, and when it has exited

The doc is great! Hoewever some areas are still missing.
C++11 intoduced raw string literals: https://en.cppreference.com/w/cpp/language/string_literal

It is useful in many different areas, like strings with quotes, multiline strings and for example windows paths without escaping backslashes:

const char win_path[] = R"(c:\some\unescaped\path)";

The same cppreference link als

Names map and input are exchanged mistakenly. By sense of Preconditions paragraph they have to be exchanged I suppose, because there is no problem when map and result coincide (in current context).

It would be a cool proof of concept to see Flecs running in the browser. As a first step towards this, the ecs_graphics project could be ported as it showcases the bare minimum for a game with graphics (input + rendering).

Link to example:
https://github.com/SanderMertens/ecs_graphics