Exposes type names as is function properties

Adds getters (instead of basic properties) to the `is` function for each type descriptor name.

This allows using `is.number` or `is.object` directly
instead of passing strings to methods like `is(val).all()`.

Author: wizard04wsu

isType.mjs.js

@@ -147,10 +147,12 @@ function is(value){
 for(const propName in new TypeTest()){
 	// For each descriptor name:
 
-	// Add an enumerable property to the `is` function.
+	// Add a getter to the `is` function that returns the name of the descriptor.
+	// This allows you to do `is(val).all(is.number, is.object)` instead of `is(val).all('number', 'object')`.
 	Object.defineProperty(is, propName, {
-		value: propName,
+		get: function(){ return propName; },
 		enumerable: true,
+		configurable: true,
 	});
 }