changes in sbcl-2.0.11 relative to sbcl-2.0.10:
* minor incompatible change: (ARRAY NIL (*)) is not a subtype of STRING,
as is consistent with a majority of maintained CL implementations.
* minor incompatible change: ARRAY-RANK-LIMIT is decreased from 65529 to 256
* optimization: TYPEP on structure types is faster and more compact on
x86[-64] and ppc64.
* optimization: LOGCOUNT is faster on arm64.
* optimization: SIGNUM can be inlined if its argument type is known.
(lp#1903533)
* bug fix: compiler crash in tail call handling. (lp#1903938)
* bug fix: crash in traceroot. (lp#1903419, reported by Michal Herda)
* bug fix: DESCRIBE called with a string as second argument no longer mutates
that string. (lp#1903901, reported by Michal Herda)
* bug fix: stack clobbering by 256-bit SIMD packs on x86-64. (lp#1901685,
reported by Marco Heisig)