changes in sbcl-2.2.7 relative to sbcl-2.2.6:

  * minor incompatible change: the compiler emits full WARNINGs for undefined
    references to variables in TYPE and DYNAMIC-EXTENT declarations, and for
    SETQ of an undefined variable.  (This was the historic behaviour for
    everything except the DYNAMIC-EXTENT case, which used to emit a
    STYLE-WARNING, but these diagnostics got lost in a refactoring since
    sbcl-2.2.2)
  * minor incompatible change: literal objects (strings, in particular)
    in compiled code may at the discretion of the runtime be placed in
    read-only memory. Violations of CLHS 3.7.1 could produce memory faults.
    If ":PURIFY NIL" is given to SAVE-LISP-AND-DIE then no read-only memory
    will be used.
  * enhancement: Unicode support has been updated to support version 10.0.0 of
    the Unicode standard, including addition of characters and refinements to
    breaking and collation algorithms.
  * bug fix: AVX is no longer used for loading simd-pack-256 constants.
    (lp#1928097)
  * bug fix: fix building the manual when some contribs are blocked or
    otherwise disabled.  (lp#1979821, thanks to Robert Schiele)
  * bug fix: fix type derivation of sequence functions with highly-specific
    declared argument types.  (lp#1980292, reported by James Kalenius)
  * bug fix: internal error when optimizing chains of conditionals in local
    functions.  (lp#1981607, reported by Pasha K)
  * bug fix: fix comparison of negative floats with bignums.
  * optimization: faster TRUNCATE with float arguments.
  * optimization: EQUALP hashing of large floating point values should
    generate less garbage.
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