fixup! fixup! Fix layout context prop resolving for boolean types (#567)

src/components/_helpers/resolveContextOrProp.js

@@ -1,4 +1,7 @@
 export const resolveContextOrProp = (contextValue, propValue) => {
+  // We need to test:
+  //  * `false` - for when the `contextValue` is boolean
+  //  * `null` - for when the `contextValue` is non-boolean
   if (contextValue === false || contextValue === null) {
     return propValue;
   }