Explicit over implicit: fail loudly, no hidden defaults¶

canvodpy's users are scientists who must be able to trust that a result was computed the way they asked. A missing or wrong input stops with a message that says what to do; nothing falls back silently. A default in a signature or a documented settings model is visible and fine. Library code reading the settings file behind the caller's back, or an except that substitutes a value, is not: entry points (the command-line tool, Site) read the settings and pass them down.