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+  o Minor bugfixes:
+    - Silence clang warnings under --enable-expensive-hardening, including:
+        + implicit truncation of 64 bit values to 32 bit;
+        + const char assignment to self;
+        + tautological compare; and
+        + additional parentheses around equality tests. (gcc uses these to
+          silence assignment, so clang warns when they're present in an
+          equality test. But we need to use extra parentheses in macros to
+          isolate them from other code).
+      Fixes bug 13577.