Fixes #671. The method isOptionSelected on options of type 'object' was cycling but no returning after an existing option was found (true), resetting to false on next option.

src/components/Select.vue

@@ -905,13 +905,16 @@
        */
       isOptionSelected(option) {
         let selected = false
-          this.valueAsArray.forEach(value => {
+        let i = 0
+        while (!selected && i < this.valueAsArray.length) {
+          let value = this.valueAsArray[i]
           if (typeof value === 'object') {
             selected = this.optionObjectComparator(value, option)
-            } else if (value === option || value === option[this.index]) {
+          } else if (value === option || value === option[i]) {
             selected = true
           }
-          })
+          i++
+        }
         return selected
       },