sbcl-1.3.20

changes in sbcl-1.3.20 relative to sbcl-1.3.19:
  * minor incompatible change: DEF{GENERIC,METHOD} no longer accept some
    illegal lambda lists such as (defgeneric bar (foo &key foo)) or
    (defgeneric baz (t)) that were accepted before.
  * optimization: a valueless &AUX binding in a BOA constructor does not
    force all slots reads in safe code to perform a full type check.
  * optimization: ATOMIC-PUSH and ATOMIC-POP generate better code
  * bug fix: the low-level debugger would erroneously print - or not print
    as the case may be - "(bad-address)" for some objects depending whether
    the --dynamic-space-size argument was used at Lisp startup
  * bug fix: a DEFCONSTANT with a non non-eql-comparable object as the value
    could cause miscompilation if that constant appeared as the default
    expression for an &OPTIONAL binding
  * bug fix: generic function lambda lists are now checked for repeated
    and otherwise illegal entries. (lp#1704114)
  * bug fix: setting gencgc_verbose = 1 could cause deadlock in fprintf()
    depending on the platform's stdio implementation. The relevant code
    has been changed to use snprintf() and write() instead.
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