code: @Nullable
    public static IJson readFromStream (@Nonnull final IHasInputStream aISP, @Nonnull final Charset aFallbackCharset)
    {
      return readFromStream (aISP, aFallbackCharset, null);
    }
docs: Read the Json from the passed {@link IHasInputStream}.
  
  @param aISP
  The input stream provider 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.