fix: aligned edge case behavior of EqualValues with Equal

all equality assertions should fail the same when input is a function.

fix: type safety added CanInterface guard to EqualExportedValues (even
if it seems currently impossible to make it panic with current reflect)

test: refactored equal tests

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

Author: fredbi

docs/doc-site/project/maintainers/ROADMAP.md

@@ -22,10 +22,10 @@ timeline
                     : removed deprecated
                     : optional dependencies (colorized)
                     : upstream PRs: Kind/NotKind
-                    : generics
-    v2.2 (Fev 2026) : generics (cont.)
+    v2.2 (Fev 2026) : : generics
+                    : SortedT, NotSortedT
                     : JSON assertions. JSONMarshalsAs...
-                    : IsSorted, IsSortedFunc
+                    : complete test refactoring
                     : more benchmarks. Perf improvements
     v2.3 (Mar 2026) : other extensions (TBD)
                     : more documentation and examples