Add docs for isConstructor()

docs/.vuepress/archive/Version0x.ts

@@ -38,6 +38,7 @@ export default PagesCollection.make('v0.x', '/v0x', [
                     'packages/support/install',
                     'packages/support/meta',
                     'packages/support/objects',
+                    'packages/support/reflections',
                     'packages/support/misc',
                 ]
             },

docs/archive/current/packages/support/reflections.md

@@ -0,0 +1,31 @@
+---
+title: Reflections
+description: Reflection utilities
+sidebarDepth: 0
+---
+
+# Reflections <Badge type="tip" text="Available since v0.7" vertical="middle" />
+
+The `@aedart/support/reflections` submodule offers a few reflection related utilities. 
+
+[[TOC]]
+
+## `isConstructor`
+
+Based on the [TC39 `Function.isCallable() / Function.isConstructor()`](https://github.com/caitp/TC39-Proposals/blob/trunk/tc39-reflect-isconstructor-iscallable.md) proposal, the `isConstructor()` can determine if given argument is a constructor.
+
+```js{6,8-9}
+import { isConstructor } from "@aedart/support/reflections";
+
+isConstructor(null); // false
+isConstructor({}); // false
+isConstructor([]); // false
+isConstructor(function() {}); // true
+isConstructor(() => {}); // false
+isConstructor(Array); // true
+isConstructor(class {}); // true
+```
+
+**Acknowledgement**
+
+The source code of the above shown methods is heavily inspired by Denis Pushkarev's Core-js implementation of the [Function.isCallable / Function.isConstructor](https://github.com/zloirock/core-js#function-iscallable-isconstructor-) proposal (_License MIT_).