code: @Nullable
    public static IJson readFromStream (@Nonnull final InputStream aIS, @Nonnull final Charset aFallbackCharset)
    {
      return readFromStream (aIS, aFallbackCharset, null);
    }
docs: Read the Json from the passed {@link InputStream}.
  
  @param aIS
  The input stream to use. May not be <code>null</code>.
  @param aFallbackCharset
  The charset to be used if no BOM is present. May not be
  <code>null</code>.
  @return <code>null</code> if reading failed, the Json declarations
  otherwise.