I haven't read it fully yet but it seems to support the view that foreign investors should not hedge their currency exposure in US stocks due to negative correlation between US currency fluctuation and stock market returns. (canadiancapitalist.com)
[1] To be fair, the decision to not hedge the currency exposure in international equities during the past decade had a lot to do with the weak U.S. dollar against major currencies. (indexologyblog.com)
TDB904 hedges the currency exposure for a small extra fee of 0.15 % and is designed to provide the same total return as the S&P 500 in its local currency, in this case the US dollar. (canadiancapitalist.com)