old_contents: #!/usr/bin/env node
  
  require('./proof')(1, function (step, tmp, Strata, equal, gather) {
      var fs = require('fs'), strata, value = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTU'
      step(function () {
          strata = new Strata({ directory: tmp, leafSize: 3, branchSize: 3 })
          strata.create(step())
      }, function () {
          strata.mutator(value, step())
      }, function (cursor) {
          step(function () {
              cursor.insert(value, value, ~ cursor.index, step())
          }, function (inserted) {
              cursor.unlock()
          })
      }, function () {
          strata.close(step())
      }, function () {
          strata = new Strata({ directory: tmp, leafSize: 3, branchSize: 3 })
          strata.open(step())
      }, function () {
          gather(step, strata)
      }, function (records) {
          equal(records[0], value, 'done')
          strata.close(step())
      })
  })
  
new_contents: #!/usr/bin/env node
  
  require('./proof')(1, function (step, Strata, tmp, gather, equal) {
      var strata, value = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTU'
      step(function () {
          strata = new Strata({ directory: tmp, leafSize: 3, branchSize: 3 })
          strata.create(step())
      }, function () {
          strata.mutator(value, step())
      }, function (cursor) {
          step(function () {
              cursor.insert(value, value, ~ cursor.index, step())
          }, function (inserted) {
              cursor.unlock()
          })
      }, function () {
          strata.close(step())
      }, function () {
          strata = new Strata({ directory: tmp, leafSize: 3, branchSize: 3 })
          strata.open(step())
      }, function () {
          gather(step, strata)
      }, function (records) {
          equal(records[0], value, 'done')
          strata.close(step())
      })
  })
  
subject: Tidy `t/coverage/length-adjust.t.js`.