user-defined methods on SLOT-BOUNDP-USING-CLASS and (SETF
SLOT-VALUE-USING-CLASS), and no longer causes errors with
non-standard SLOT-DEFINITION-ALLOCATION values.
+ * optimization: improved performance of BIT and SBIT on bit-vectors.
changes in sbcl-0.8.12 relative to sbcl-0.8.11:
* minor incompatible change: the system no longer provides