Wrong `this` after adding decorator

[ylc395]

RuntimeTypeChecks/src/index.ts

Lines 70 to 74 in f3d8bb5

	function wrapMethod(descriptor, checks) {
	return wrapValue(descriptor, (...args) => {
	assertArgs(checks, args);
	return descriptor.value(...args);
	});

Should these lines be like this?

 function wrapMethod(descriptor, checks) { 
   return wrapValue(descriptor, (...args) => { 
     assertArgs(checks, args); 
     descriptor.value = function() => {
         return descriptor.value(...args); 
     };
   }); 

Only something like this works in my TypeScript app, or I will get wrong this: