fix(radio): do not use strict comparison for values

Closes #5660

ionic/components/radio/radio-button.ts

@@ -142,7 +142,7 @@ export class RadioButton {
    * @private
    */
   ngOnInit() {
-    if (this._group && isDefined(this._group.value) && this._group.value === this.value) {
+    if (this._group && isDefined(this._group.value) && this._group.value == this.value) {
       this.checked = true;
     }
   }

ionic/components/radio/radio-group.ts

@@ -148,7 +148,7 @@ export class RadioGroup {
 
       // check this radiobutton if its value is
       // the same as the radiogroups value
-      radioButton.checked = (radioButton.value === this.value);
+      radioButton.checked = (radioButton.value == this.value);
 
       if (radioButton.checked) {
         // if this button is checked, then set it as
@@ -183,7 +183,7 @@ export class RadioGroup {
   remove(button: RadioButton) {
     let index = this._btns.indexOf(button);
     if (index > -1) {
-      if (button.value === this.value) {
+      if (button.value == this.value) {
         this.value = null;
       }
       this._btns.splice(index, 1);

ionic/components/radio/test/basic/index.ts

@@ -14,6 +14,7 @@ class E2EApp {
   items: Array<{description: string, value: any}>;
   relationship: string;
   pet: string;
+  selectedTime: number = 60;
 
   constructor() {
     this.fruits = new Control('apple');

ionic/components/radio/test/basic/main.html

@@ -99,7 +99,7 @@
     <code><b>pet:</b> {{pet}}</code>
   </div>
 
-  <ion-list radio-group [(ngModel)]="someNumber">
+  <ion-list radio-group [(ngModel)]="someValue">
     <ion-item *ngFor="#item of items">
       <ion-label>
         {{ item.description }}
@@ -110,7 +110,21 @@
   </ion-list>
 
   <div padding>
-    <code><b>someNumber:</b> {{someNumber}}</code>
+    <code><b>someValue:</b> {{someValue}}</code>
   </div>
 
+  <ion-list radio-group [(ngModel)]="selectedTime">
+    <ion-list-header>
+      Time
+    </ion-list-header>
+    <ion-item>
+      <ion-label>60 minutes</ion-label>
+      <ion-radio value="60"></ion-radio>
+    </ion-item>
+    <ion-item>
+      <ion-label>30 minutes</ion-label>
+      <ion-radio value="30"></ion-radio>
+    </ion-item>
+  </ion-list>
+
 </ion-content>