It isn't "fancy speak" because those abstractions - language features - are intentionally so as not to have a non-zero cost implementation. It isn't an optimiza

It isn't "fancy speak" because those abstractions - language features - are intentionally so as not to have a non-zero cost implementation. It isn't an optimization pass and the programmer doesn't need to worry about a degenerate case causing it to fall through to a less optimized implementation.