Boolean decoding is not case-sensitive (#472)

Author: vastray

src/core/value_properties.ts

@@ -175,7 +175,7 @@ const readers: { [type: string]: Reader } = {
   },
 
   boolean(value: string): boolean {
-    return !(value == "0" || value == "false")
+    return !(value == "0" || String(value).toLowerCase() == "false")
   },
 
   number(value: string): number {

src/tests/modules/core/value_tests.ts

@@ -66,6 +66,10 @@ export default class ValueTests extends ControllerTestCase(ValueController) {
     this.controller.shadowedBooleanValue = 1 as any
     this.assert.deepEqual(this.controller.shadowedBooleanValue, true)
     this.assert.deepEqual(this.get("shadowed-boolean-value"), "1")
+
+    this.controller.shadowedBooleanValue = "False" as any
+    this.assert.deepEqual(this.controller.shadowedBooleanValue, false)
+    this.assert.deepEqual(this.get("shadowed-boolean-value"), "False")
   }
 
   "test array values"() {