add immutable presentAs method to Dish for node REPL display. add test for exact match help

src/core/Dish.mjs

@@ -184,6 +184,22 @@ class Dish {
         }
     }
 
+    /**
+     * Returns the Dish as the given type, without mutating the original dish.
+     *
+     * If running in a browser, get is asynchronous.
+     *
+     * @Node
+     *
+     * @param {number} type - The data type of value, see Dish enums.
+     * @param {boolean} [notUTF8=false] - Do not treat strings as UTF8.
+     * @returns {Dish | Promise} - (Broswer) A promise | (Node) value of dish in given type
+     */
+    presentAs(type, notUTF8=false) {
+        const clone = this.clone();
+        return clone.get(type, notUTF8);
+    }
+
 
     /**
      * Validates that the value is the type that has been specified.

src/node/File.mjs

@@ -21,12 +21,17 @@ class File {
      *
      * https://w3c.github.io/FileAPI/#file-constructor
      *
-     * @param {String|Array|ArrayBuffer|Buffer} bits - file content
+     * @param {String|Array|ArrayBuffer|Buffer|[File]} bits - file content
      * @param {String} name (optional) - file name
      * @param {Object} stats (optional) - file stats e.g. lastModified
      */
     constructor(data, name="", stats={}) {
-        const buffers = data.map(d => Buffer.from(d));
+        const buffers = data.map((d) => {
+            if (d instanceof File) {
+                return Buffer.from(d.data);
+            }
+            return Buffer.from(d);
+        });
         const totalLength = buffers.reduce((p, c) => p + c.length, 0);
         this.data = Buffer.concat(buffers, totalLength);
 

src/node/NodeDish.mjs

@@ -53,14 +53,14 @@ class NodeDish extends Dish {
      * Avoid coercion to a String primitive.
      */
     toString() {
-        return this.get(Dish.typeEnum("string"));
+        return this.presentAs(Dish.typeEnum("string"));
     }
 
     /**
      * What we want to log to the console.
      */
     [util.inspect.custom](depth, options) {
-        return this.get(Dish.typeEnum("string"));
+        return this.presentAs(Dish.typeEnum("string"));
     }
 
     /**
@@ -68,14 +68,14 @@ class NodeDish extends Dish {
      * Log only the value to the console in node.
      */
     inspect() {
-        return this.get(Dish.typeEnum("string"));
+        return this.presentAs(Dish.typeEnum("string"));
     }
 
     /**
      * Avoid coercion to a Number primitive.
      */
     valueOf() {
-        return this.get(Dish.typeEnum("number"));
+        return this.presentAs(Dish.typeEnum("number"));
     }
 
 }