incorrect parameter replacement when one variable is the prefix of another

Here's my code:

CurrentSession.CreateQuery(
@"FROM Opportunity o WHERE Id IN (:foo) OR Id = :foobar")
.SetParameterList("foo", new long[] { 1, 2 })
.SetInt64("foobar", 3)
.List<Opportunity>();

I get an exception that says that it can't find the variable foobar in the query, and the query so far looks something like this:

WHERE Id IN (:foo0_, :foo1_) OR Id = :foo0_, :foo1_bar

It's easy to see that :foo is replaced in both places, even in :foobar, resulting in the replaced value of foo and then bar staying there without being touched. Solution: ":foo" should be replaced with "foo", but, although ":foobar" starts with ":foo", it doesn't end there with a parenthesis or whitespace or any other special token delimiter, it has some more characters following in its name, therefore it's a different variable.