changes in sbcl-1.3.11 relative to sbcl-1.3.10:
* minor incompatible change: SB-EXT:*INTEXP-MAXIMUM-EXPONENT* is removed.
* enhancement: TRACE ... :REPORT {TRACE,NIL} now work as advertised in the
documentation string (based on patch by Patrick Stein)
* enhancement: support unboxed signed-word structure slots on x86, x86-64
and ARM64. (lp#377616)
* optimization: faster logical bit-array operations on multidimensional
arrays.
* optimization: better GC performance in the presence of many threads.
(patch by Ilya Perminov, lp#1339924)
* optimization: multiple-value-call is optimized with multiple argument
forms, not just one. (lp#753803)
* bug fix: MAKE-ALIEN-STRING returns the number of allocated bytes as a
second value as advertised (reported by Johann 'Myrkraverk' Oskarsson)
* bug fix: when TO-READTABLE is supplied to COPY-READTABLE, it will
contain only the macros in FROM-READTABLE and no others. (lp#1631506)
* enhancement: gencgc has been modified for x86-64 on Linux and macOS
to a support mark-and-sweep as well as the traditional copying strategy.
It is conceivable that some applications might be adversely affected.
Please see ':immobile-space' in 'base-target-features.lisp-expr'
for further details, and possible reasons to disable this feature.
* enhancement: x86-64 supports shrinking the fixed overhead in a structure
from 2 words to 1 word, reducing memory consumption in applications
which create many small structures.