changes in sbcl-1.5.0 relative to sbcl-1.4.16:

  * enhancement: SB-COVER emulates IN-PACKAGE when recording source maps;
    this makes it possible to generate coverage for forms that uses local
    package nicknames, or otherwise must be read in the correct package.
  * build enhancement: new host quirks mechanism, support for building under
    ABCL and ECL (as well as CCL, CMUCL, CLISP and SBCL itself)
  * optimization: (FIND-SYMBOL x "P") for constant "P" executes faster,
    subject to "P" not being a package-local nickname of any
    package. Similarly INTERN.  (lp#1814924)
  * optimization: bounds checks are elided when possible where the same array
    is dereferenced multiple times.
  * bug fix: initargs are now deduplicated when computing effective slots.
  * bug fix: TREE-EQUAL with :TEST 'EQL now correctly computes its answer.
    (reported by Bahodir Mansurov)
  * bug fix: compiled (COERCE x 'FLOAT) no longer coerces double-floats into
    single-floats.  (reported by J. Gareth Williams)
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