[Fix] recognize document.all in IE 6-10

Author: ljharb

index.js

@@ -46,16 +46,16 @@ var toStr = Object.prototype.toString;
 var objectClass = '[object Object]';
 var fnClass = '[object Function]';
 var genClass = '[object GeneratorFunction]';
-var ddaClass = '[object HTMLAllCollection]';
+var ddaClass = '[object HTMLAllCollection]'; // IE 11
 var ddaClass2 = '[object HTML document.all class]';
-var ddaClass3 = '[object HTMLCollection]'; // opera 12.16
+var ddaClass3 = '[object HTMLCollection]'; // IE 9-10
 var hasToStringTag = typeof Symbol === 'function' && !!Symbol.toStringTag; // better: use `has-tostringtag`
 
 var isIE68 = !(0 in [,]); // eslint-disable-line no-sparse-arrays, comma-spacing
 
 var isDDA = function isDocumentDotAll() { return false; };
 if (typeof document === 'object') {
-	// Firefox 3 canonicalized DDA to undefined when it's not accessed directly
+	// Firefox 3 canonicalizes DDA to undefined when it's not accessed directly
 	var all = document.all;
 	if (toStr.call(all) === toStr.call(document.all)) {
 		isDDA = function isDocumentDotAll(value) {
@@ -64,8 +64,12 @@ if (typeof document === 'object') {
 			if ((isIE68 || !value) && (typeof value === 'undefined' || typeof value === 'object')) {
 				try {
 					var str = toStr.call(value);
-					// IE 6-8 uses `objectClass`
-					return (str === ddaClass || str === ddaClass2 || str === ddaClass3 || str === objectClass) && value('') == null; // eslint-disable-line eqeqeq
+					return (
+						str === ddaClass
+						|| str === ddaClass2
+						|| str === ddaClass3 // opera 12.16
+						|| str === objectClass // IE 6-8
+					) && value('') == null; // eslint-disable-line eqeqeq
 				} catch (e) { /**/ }
 			}
 			return false;
@@ -78,13 +82,12 @@ module.exports = reflectApply
 		if (isDDA(value)) { return true; }
 		if (!value) { return false; }
 		if (typeof value !== 'function' && typeof value !== 'object') { return false; }
-		if (typeof value === 'function' && !value.prototype) { return true; }
 		try {
 			reflectApply(value, null, badArrayLike);
 		} catch (e) {
 			if (e !== isCallableMarker) { return false; }
 		}
-		return !isES6ClassFn(value);
+		return !isES6ClassFn(value) && tryFunctionObject(value);
 	}
 	: function isCallable(value) {
 		if (isDDA(value)) { return true; }

test/index.js

@@ -202,7 +202,7 @@ test('DOM', function (t) {
 		st.notOk(isCallable(document), 'document is not callable');
 
 		var all = document.all;
-		var isFF3 = Object.prototype.toString(all) === Object.prototype.toString.call(document.all);
+		var isFF3 = !isIE68 && Object.prototype.toString(all) === Object.prototype.toString.call(document.all); // this test is true in IE 6-8 also
 		var expected = false;
 		if (!isFF3) {
 			try {