Agreed, but it is especially insidious here because for integer literals like 0 or 1, etc - it is common to simply assign or pass those directly to other intege

Agreed, but it is especially insidious here because for integer literals like 0 or 1, etc - it is common to simply assign or pass those directly to other integer types, and 99% of the time, C++ does the right thing. Here it still does the right thing in that the code is correct, but you walk off a performance cliff.