This reverts commit 8dea549887.
Revert "fix following up 8c4fa25c8d65e75978c0a82bc6391906595ff190"
This reverts commit 8726312393.
Revert "attempt to fix "error: chosen constructor is explicit in copy-initialization" error with gcc"
This reverts commit 8c4fa25c8d.
Revert "use `initializer_list const&` to hold expected values (via @lighmare) ref #3636"
This reverts commit 47763afef3.