title: Why are delimited continuation primitives named "shift" and "reset"?
body: <p>I think I understand (in general) what <code>shift</code> and <code>reset</code> mean. However I do not understand why they are named so ? What do <code>shift</code> and <code>reset</code> as Delimited Continuation primitives have to do with "shift" and "reset" words in English?</p>