comp-undo-steps 3: Instead of using an identity function to cap things off, use an unboxing/result-extracting function.

comp-undo-steps-3-no-ident-fn.js

function handleSomeThing(ctx) {
  return compose(
    stepA(optionsA),
    stepB(optionsB),
    stepC(optionsC),
  )(pctx => pctx.resultFoo)({ ctx });
}

// Or somewhat more mysterious looking...
const handleSomeThing = compose(
  // the Process Context boxing-up function.
  next => ctx => next({ ctx }),
  stepA(optionsA),
  stepB(optionsB),
  stepC(optionsC),
)(pctx => pctx.resultFoo);