+changes in sbcl-0.8.12 relative to sbcl-0.8.11:
+ * minor incompatible change: the system no longer provides
+ optimization hints (conditions which are TYPEP
+ SB-EXT:COMPILER-NOTE) for conforming code in default compilation
+ mode; these hints are emitted when higher SPEED optimization is
+ requested, as before.
+ * the behaviour of the standard function ED is now customizeable by
+ third parties through a hook variable: see ED's documentation
+ string for information on the protocol.
+ * the compiler no longer emits efficiency notes for (FUNCALL X)
+ when the type of X is uncertain under default optimization
+ settings.
+ * fixed bug 276: mutating a binding of a specialized parameter to a
+ method to something that is not TYPEP the specializer is now
+ possible.
+ * fixed bugs 45d and 118: DOUBLE-FLOAT[-NEGATIVE]-EPSILON now
+ exhibit the required behaviour on the x86 platform. (thanks to
+ Peter van Eynde, Eric Marsden and Bruno Haible)
+ * fixed bug 335: ATANH now computes the inverse hyperbolic tangent
+ even for difficult arguments. (reported by Peter Graves)
+ * fixed bug 141a: the backquote printer now descends quoted
+ structure.
+ * fixed another bug in backquote printing: no more destructive
+ modification of the form's list structure. (reported by Brian
+ Downing)
+ * fixed bug in INTERRUPT-THREAD: pin the function, so that it cannot
+ move between its address being taken and the call to
+ interrupt_thread, fixing a crashing race condition.
+ * the SB-POSIX contrib implementation has been adjusted so that it
+ no longer exhibits ridiculously poor performance when constructing
+ instances corresponding to C structs.
+