spec.test/instrument doesn't check the return value of spec'd functions and according to the spec guide this is because we should be checking function implementations at testing time, not development time. It seems to me that adding :ret and :fn checks to instrumented functions would be worthwhile even though tests are a better place to do those checks - since instrumentation is meant to be turned off in production the performance hit doesn't matter, and since we're already verifying that the arguments conform to spec, why not check the return value as well? A benefit would be that if we haven't yet written (or won't write) generators and tests, we still get a confidence increase about our instrumented functions' return values. I'm sure this was considered, so I'm just wondering if "do that in your tests" is the entire reason for this design choice.
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