Replace jQuery.isNumeric() checks with typeof

This method was deprecated in jQuery version 3.3, and removed from
jQuery as of version 4.0.0-beta.

  * https://api.jquery.com/category/deprecated/deprecated-3.3/
  * https://blog.jquery.com/2018/01/19/jquery-3-3-0-a-fragrant-bouquet-of-deprecations-and-is-that-a-new-feature/
  * https://blog.jquery.com/2024/02/06/jquery-4-0-0-beta/

Related to issue: #189

src/csscoordinates.js

@@ -28,7 +28,7 @@ function CSSCoordinates() {
 	 * @param {number} value The value of the property.
 	 */
 	me.set = function(property, value) {
-		if ($.isNumeric(value)) {
+		if (typeof value === 'number') {
 			me[property] = Math.round(value);
 		}
 	};

test/unit/placementcalculator.js

@@ -41,33 +41,33 @@ $(function() {
 				case 'ne':
 				case 'nw-alt':
 					assert.strictEqual(coords.top, 'auto', key + ': top property is set to auto');
-					assert.strictEqual($.isNumeric(coords.left), true, key + ': left property is set to a number');
+					assert.strictEqual(typeof coords.left, 'number', key + ': left property is set to a number');
 					assert.strictEqual(coords.right, 'auto', key + ': right property is set to auto');
-					assert.strictEqual($.isNumeric(coords.bottom), true, key + ': bottom property is set to a number');
+					assert.strictEqual(typeof coords.bottom, 'number', key + ': bottom property is set to a number');
 					break;
 				case 'e':
 				case 's':
 				case 'se':
 				case 'sw-alt':
-					assert.strictEqual($.isNumeric(coords.top), true, key + ': top property is set to a number');
-					assert.strictEqual($.isNumeric(coords.left), true, key + ': left property is set to a number');
+					assert.strictEqual(typeof coords.top, 'number', key + ': top property is set to a number');
+					assert.strictEqual(typeof coords.left, 'number', key + ': left property is set to a number');
 					assert.strictEqual(coords.right, 'auto', key + ': right property is set to auto');
 					assert.strictEqual(coords.bottom, 'auto', key + ': bottom property is set to auto');
 					break;
 				case 'w':
 				case 'sw':
 				case 'se-alt':
-					assert.strictEqual($.isNumeric(coords.top), true, key + ': top property is set to a number');
+					assert.strictEqual(typeof coords.top, 'number', key + ': top property is set to a number');
 					assert.strictEqual(coords.left, 'auto', key + ': left property is set to auto');
-					assert.strictEqual($.isNumeric(coords.right), true, key + ': right property is set to a number');
+					assert.strictEqual(typeof coords.right, 'number', key + ': right property is set to a number');
 					assert.strictEqual(coords.bottom, 'auto', key + ': bottom property is set to auto');
 					break;
 				case 'nw':
 				case 'ne-alt':
 					assert.strictEqual(coords.top, 'auto', key + ': top property is set to auto');
 					assert.strictEqual(coords.left, 'auto', key + ': left property is set to auto');
-					assert.strictEqual($.isNumeric(coords.right), true, key + ': right property is set to a number');
-					assert.strictEqual($.isNumeric(coords.bottom), true, key + ': bottom property is set to a number');
+					assert.strictEqual(typeof coords.right, 'number', key + ': right property is set to a number');
+					assert.strictEqual(typeof coords.bottom, 'number', key + ': bottom property is set to a number');
 					break;
 			}
 		});