private static TomlArray getArray(final TomlParseResult tomlParseResult, final String key) {
    return tomlParseResult.getArray(key);
  }
This method retrieves an array from parsed toml, using the given key.

@param tomlParseResult result of a prior toml parse
@param key key to fetch
@return The array matching the key if it exists, or null.
ethereum/permissioning/src/main/java/org/hyperledger/besu/ethereum/permissioning/PermissioningConfigurationBuilder.java