🧒 Explain like I'm 5
In a rehearsal scenario lacking real actors: a stub is a stand-in that delivers a predetermined line. A spy is someone who records "who made phone calls and how many times." A mock is a full stand-in actor who not only delivers lines but is also checked for adherence to the script.
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Senior-level deep dive: internals, pitfalls, and a self-interview ladder.
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