@CommandLine.Option(
      names = BLOCK_PROPAGATION_RANGE_FLAG,
      hidden = true,
      defaultValue = "-10..30",
      paramLabel = "<LONG>..<LONG>",
      description =
          "Range around chain head where inbound blocks are propagated (default: ${DEFAULT-VALUE})")
  public void parseBlockPropagationRange(final String arg) {
    blockPropagationRange = OptionParser.parseLongRange(arg);
  }
Parse block propagation range.

@param arg the range such as -10..30
app/src/main/java/org/hyperledger/besu/cli/options/SynchronizerOptions.java