I was reading the Wikipedia article on the Canadian Constitution, when I came across this statement (emphasis mine):
Enactment of the Charter of Rights and Freedoms has also fundamentally changed much of Canadian constitutional law. The Magna Carta, which has constitutional status in Canada, was occasionally called into service in legal argument. Since [enactment in] 1982, however, the arguments have been easier to make [...]
Unfortunately this is uncited. However, following a different citation on the page leads to this referencep. 56 which places the Magna Carta as part of the unwritten constitution. This seems odd to me as the Magna Carta is a written document, if anything I would have thought it would be part of the written constitution.
So, to what extent is the Magna Carta considered constitutional today in Canada?