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  o Minor bugfixes (performance, DoS):
    - Fix one case of a not-especially viable denial-of-service attack found
      by OSS-Fuzz in our consensus-diff parsing code. This attack causes a
      lot small of memory allocations and then immediately frees them: this
      is only slow when running with all the sanitizers enabled.  Fixes one
      case of bug 40472; bugfix on 0.3.1.1-alpha.