Merge branch 'preserve-choices-types' into 'master'

preserve choices value types

Closes #959

See merge request !1238

vue/Process/Workers/Configurations/Fields/ChoicesField.vue

 <template>
   <span class="select">
-    <select v-on:input="$emit('input', $event.target.value)">
-      <option
-        v-for="option in field.choices"
-        :value="option"
-        :key="option"
-      >
+    <select v-model="selected">
+      <option v-for="option in field.choices" :value="option" :key="option">
         {{ option }}
       </option>
     </select>
@@ -23,6 +19,16 @@ export default {
       type: [String, Number],
       required: true
     }
+  },
+  computed: {
+    selected: {
+      get () {
+        return this.value
+      },
+      set (value) {
+        this.$emit('input', value)
+      }
+    }
   }
 }
 </script>