Only allow yanked releases on version pins

TODO: add/update tests?

src/pip/_internal/resolution/resolvelib/factory.py

@@ -276,14 +276,21 @@ def iter_index_candidate_infos() -> Iterator[IndexCandidateInfo]:
             )
             icans = list(result.iter_applicable())
 
-            # PEP 592: Yanked releases must be ignored unless only yanked
-            # releases can satisfy the version range. So if this is false,
+            # PEP 592: Yanked releases must be ignored if the version range
+            # can be satisfied with non-yanked version. So if this is false,
             # all yanked icans need to be skipped.
+            # If this is true, PEP recommends ignoring the yanked releases
+            # unless the version is pinned to an exact version with ==/===.
             all_yanked = all(ican.link.is_yanked for ican in icans)
+            version_pinned = any(
+                spec.operator == "==="
+                or (spec.operator == "==" and not spec.version.endswith(".*"))
+                for spec in specifier
+            )
 
             # PackageFinder returns earlier versions first, so we reverse.
             for ican in reversed(icans):
-                if not all_yanked and ican.link.is_yanked:
+                if not (all_yanked and version_pinned) and ican.link.is_yanked:
                     continue
                 func = functools.partial(
                     self._make_candidate_from_link,