- Update to version 2.2.4
  * enhancement: better constraint propagation in the compiler. Specifically,
    the compiler can now derive the type of X in control flow join situations
    such as
    (LAMBDA (X) (ECASE (1 ...) (2 ...)) X)
    or
    (LAMBDA (X) (ETYPECASE (INTEGER ...) (SYMBOL ...)) X)
    instead of forgetting all information about X after the E(TYPE)CASE.
  * optimization: inlined functions enclosed in local macro definitions no
    longer save their entire lexical environment, reducing unnecessary
    memory retention.
  * optimization: faster (< integer fixnum) comparisons (ARM64 and x86-64).
  * platform support:
    ** RUN-PROGRAM is faster on Linux and FreeBSD if close_range(2) is
       available.
  * bug fix: block compilation now interacts more correctly with the creation
    of new packages.
  * bug fix: internal compiler error in array reference
    optimizer. (lp#1966624)
- from version 2.2.3
  * minor incompatible change: SB-THREAD:MUTEX-OWNER may return :THREAD-DEAD
    if the apparent owner either exited nearly instantly after releasing the
    mutex (and is not now the owner), or died and never released it.
  * minor incompatible change: building the system with the simple semi-space
    copying collector is no longer supported.
  * minor incompatible change: support for PPC/Darwin has been removed.
  * platform support:
    ** fix regressions in threads on RISC-V.  (lp#1962598)
    ** threads are now enabled by default on RISC-V.
    ** The generational garbage collector is now supported on MIPS.

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