+ * new build flag: :sb-xref-for-internals; SBCL will collect xref information
+ about itself during the build (e.g. for M-? in Slime), if this flag is
+ enabled in customize-target-features.lisp. This will increase the core
+ size by about 5-6mb, though, so it's mostly interesting to SBCL
+ developers.
+ * new feature: various GENCGC tuning parameters have been experimentally
+ documented and exported from SB-EXT. See documentation for details.
+ * fixes and improvements related to Unicode and external formats:
+ ** the Unicode character database has been upgraded to the
+ Unicode 5.2 standard, giving names and properties to a number of new
+ characters, and providing a few extra characters with case
+ transformations.
+ ** improvement: restarts for providing replacement input/output on coding
+ errors for fd-stream external formats.
+ ** improvement: where :<encoding> is a keyword corresponding to an
+ external format the system supports, it is now possible to specify
+ (:<encoding> :replacement <character>) as an external format which will
+ automatically substitute <character> on encoding or decoding errors for
+ streams and for STRING-TO-OCTETS and its inverse. (launchpad bug
+ lp#317072)
+ ** improvement: the file streams underlying the standard streams (such as
+ *STANDARD-INPUT*, *TERMINAL-IO*) are opened with an external format
+ which uses the replacement mechanism to handle encoding errors,
+ preventing various infinite error chains and unrecoverable I/O
+ confusion.
+ ** minor incompatible change: the utf-8 external format now correctly
+ refuses to encode Lisp characters in the surrogate range (char-codes
+ between #xd800 and #xdfff).