+ * bug fix: mutually referent alien structures now work correctly.
+ (reported by Rick Taube)
+ * bug fix: structures defined by WITH-ALIEN can be referred to
+ within other definitions in the same WITH-ALIEN.
+ * bug fix: division operators (MOD, TRUNCATE and the like) with
+ constant zero divisors and integer dividends no longer generate
+ left shifts.
+ * bug fix: provide default methods for INPUT-STREAM-P and
+ OUTPUT-STREAM-P specialized on SB-GRAY:FUNDAMENTAL-STREAM.
+ * bug fix: improve the detection and resolution of MOP metacycles
+ (where effective method computation depends on the generic function
+ having its effective method computed). (reported by Bruno Haible)
+ * bug fix: pass the right initargs to :BEFORE or :AFTER methods on
+ SHARED-INITIALIZE or INITIALIZE-INSTANCE in optimized
+ MAKE-INSTANCE constructors. (reported by Axel Schairer for cmucl)
+ * optimization: in taking the GCD of bignums, reduce the two bignums
+ to approximately the same size (using Euclid's algorithm) before
+ applying the more sophisticated binary GCD. (thanks to Juho
+ Snellman)
+ * optimization: COUNT on bitvectors now operates word-at-a-time.
+ * optimization: ASH with a positive, but not necessarily constant,
+ (leftwards) shift, when in a modular context, is compiled to a
+ hardware shift.
+ * fixed some bugs revealed by Paul Dietz' test suite:
+ ** FORMAT variable parameters ("~V<char>") are defaulted properly
+ if the corresponding argument is NIL.
+ ** FORMAT directives accepting a minpad parameter treat negative
+ values as 0.
+ ** literal commas as character parameters to FORMAT directives are
+ parsed correctly.
+ ** literal spaces directly after ~<Newline> directives within a
+ format-logical-block (~:< ~@:>) do not induce :FILL-style
+ conditional newlines.
+ ** PRINT-UNREADABLE-OBJECT inserts spaces as specified (and only
+ as specified: it no longer includes conditional newlines).
+ ** PRINC-TO-STRING binds *PRINT-READABLY* to NIL (as well as
+ *PRINT-ESCAPE*).
+ ** PPRINT-LOGICAL-BLOCK signals a TYPE-ERROR if its :PREFIX or
+ :PER-LINE-PREFIX argument does not evaluate to a string.