sclass JECompressionRegime<Data> is CompressionRegime_AnyType<IJavaExpr<Data>> {
  settable bool quickEval = true;
  settable bool fullEval = false;
  
  byte[] metaCompress(byte[] c) {
    //ret gzipBytes(c);
    ret c;
  }
  
  public byte[] decompressorToBytes(IJavaExpr decompressor) {
    ret metaCompress(toUtf8(str(decompressor)));
  }
  
  public IJavaExpr decompressorFromBytes(byte[] compressed) {
    print("decompressorFromBytes");
    ret javaExpr(fromUtf8(gunzipBytes(compressed)));
  }
  
  public O runDecompressor(IJavaExpr code) {
    if (code == null) null;
    
    if (quickEval) try {
      ret code.quickEval();
    } catch e {
      if (!fullEval)
        rethrow(e);
      else
        printStackTrace(e);
    }
      
    if (fullEval) {
      print("*** FULL JAVA EVAL ***");
      ret dm_javaEval(str(code));
    }
    
    fail("No way to eval " + shorten(100, sfu(code)));
  }
  
  public swappable CompressionRegime_AnyType fullRegime() { null; }
}

Began life as a copy of #1033160