Not trying to be pedantic. When I hear "leave it to the compiler", I normally think, "let the compiler optimize it, rather than optimizing it yourself". The compiler is doing the initialization either way, but in one case you're relying on a correct understanding of minutiae of the language spec (both for you and all future readers and writers of the code), in another case you're explicitly instructing the compiler to initialize it to zero.
Yes and I'm saying that in this case the correct and practical choice is to be explicit. No one needs to go read the standard to know that two fields defaulted to false in the strict definition are defaulted to false...