my favourite documentation is minimal running code examples. give me example inputs to get the job done - i.e. not just "inputs: x is a y", but actually create

my favourite documentation is minimal running code examples. give me example inputs to get the job done - i.e. not just "inputs: x is a y", but actually create a minimal version of y and show it going into f(x) and coming back out as a genuine object (as opposed to a mock) that I can inspect/prod until I understand what's happening.