fix(template): prevent default values from overriding props

packages/shared/src/is.ts

@@ -28,7 +28,7 @@ export function isNumber (o: unknown): o is number {
 }
 
 export function isBooleanStringLiteral (o: unknown): o is string {
-  return o === 'true' || o === 'false'
+  return o === 'true' || o === 'false' || o === '!0' || o === '!1'
 }
 
 export function isObjectStringLiteral (o: unknown): o is string {