t27 basics 12: a function signature, piece by piece

The pieces of a t27 function signature in both styles the compiler accepts, and the generics it does not. Lesson 12 of the t27 basics course.

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Where the numbers come from

The lesson spec public/t27/files/specs/basics/12_functions.t27, compiled clean on 7 backends by public/t27/t27_compiler.wasm, whose tests pass in the site test runner
Compiler verdicts, error lines, code and counts quoted on this page are what the same wasm answered in node 22 when the course was authored; words without a run behind them are said to be read, not run