Issue #452: Fix 500 error with `%` in `code`. (#453)

* Issue #452: Fix 500 error with `%` in `code`.

* Issue #452: Revert the unnecessary change in `serializeState()`.

* encodeURI -> encodeURIComponent

lib/routing.js

@@ -80,7 +80,6 @@ export const getQueryStringState = query => {
   }
 
   const state = mapper.map(mappings, query)
-  deserializeCode(state)
 
   Object.keys(state).forEach(key => {
     if (state[key] === '') state[key] = undefined
@@ -92,19 +91,9 @@ export const getQueryStringState = query => {
 export const updateQueryString = state => {
   if (history.location.search.indexOf('react_perf') < 0) {
     const mappedState = mapper.map(reverseMappings, state)
-    serializeCode(mappedState)
 
     history.replace({
-      search: encodeURI(keysToQuery(mappedState))
+      search: encodeURIComponent(keysToQuery(mappedState))
     })
   }
 }
-
-// private
-function serializeCode(state) {
-  if (state.code) state.code = encodeURIComponent(state.code)
-}
-
-function deserializeCode(state) {
-  if (state.code) state.code = decodeURIComponent(state.code)
-}