toString for Single/Double

implementations/javascript/package.json

@@ -1,6 +1,6 @@
 {
   "name": "preserves",
-  "version": "0.0.15",
+  "version": "0.0.16",
   "description": "Experimental data serialization format",
   "homepage": "https://gitlab.com/tonyg/preserves",
   "license": "MIT",

implementations/javascript/src/values.js

@@ -74,6 +74,10 @@ function Float(value) {
   _Float.call(this, value);
 }
 
+Float.prototype.toString = function () {
+  return '' + this.value;
+};
+
 Float.prototype.hashCode = function () {
   return this.value | 0; // TODO: something better?
 };

implementations/javascript/test/test-values.js

@@ -0,0 +1,21 @@
+"use strict";
+
+const chai = require('chai');
+const expect = chai.expect;
+chai.use(require('chai-immutable'));
+
+const Immutable = require('immutable');
+
+const { is, Single, Double, fromJS } = require('../src/index.js');
+
+describe('Single', () => {
+  it('should print reasonably', () => {
+    expect(Single(123.45).toString()).to.equal("123.45");
+  });
+});
+
+describe('Double', () => {
+  it('should print reasonably', () => {
+    expect(Double(123.45).toString()).to.equal("123.45");
+  });
+});