Revert json conversion

lib/cycle.js

@@ -3,8 +3,6 @@ import { getCycleLengthStats } from './cycle-length'
 const LocalDate = joda.LocalDate
 const DAYS = joda.ChronoUnit.DAYS
 
-const toJSON = (realmObj) => JSON.parse(JSON.stringify(realmObj))
-
 export default function config(opts) {
   let bleedingDaysSortedByDate
   let cycleStartsSortedByDate
@@ -16,13 +14,10 @@ export default function config(opts) {
   if (!opts) {
     // we only want to require (and run) the db module
     // when not running the tests
-    bleedingDaysSortedByDate = toJSON(
-      require('../db').getBleedingDaysSortedByDate()
-    )
-    cycleStartsSortedByDate = toJSON(
-      require('../db').getCycleStartsSortedByDate()
-    )
-    cycleDaysSortedByDate = toJSON(require('../db').getCycleDaysSortedByDate())
+    bleedingDaysSortedByDate = require('../db').getBleedingDaysSortedByDate()
+    cycleStartsSortedByDate = require('../db').getCycleStartsSortedByDate()
+    cycleDaysSortedByDate = require('../db').getCycleDaysSortedByDate()
+
     maxBreakInBleeding = 1
     maxCycleLength = 99
     minCyclesForPrediction = 3