- Update to version 4.1.0
  New features:
  * Implement decay-based unused dirty page purging, a major optimization
    with mallctl API impact. This is an alternative to the existing ratio-based
    unused dirty page purging, and is intended to eventually become the sole 
    purging mechanism. New mallctls:
    + opt.purge
    + opt.decay_time
    + arena.<i>.decay
    + arena.<i>.decay_time
    + arenas.decay_time
    + stats.arenas.<i>.decay_time
  * Add --with-malloc-conf, which makes it possible to embed a default options
    string during configuration. This was motivated by the desire to specify 
    --with-malloc-conf=purge:decay , since the default must remain purge:ratio
    until the 5.0.0 release.
  * Make *allocx() size class overflow behavior defined. The maximum size
    class is now less thanPTRDIFF_MAX to protect applications against numerical
    overflow, and all allocation functions are guaranteed to indicate errors 
    rather than potentially crashing if the request size exceeds the maximum size class.
  * jeprof:
    + Add raw heap profile support.
    + Add --retain and --exclude for backtrace symbol filtering.
  Optimizations:
  * Optimize the fast path to combine various bootstrapping and configuration
    checks and execute more streamlined code in the common case.
  * Use linear scan for small bitmaps (used for small object tracking). 
   In addition to speeding up bitmap operations on 64-bit systems, this reduces
   allocator metadata overhead by approximately 0.2%.
  * Separate arena_avail trees, which substantially speeds up run tree operations.

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