Added cases that reproduce the "send 0" problem.

package.json

@@ -38,6 +38,7 @@
   "devDependencies": {
     "@types/bson": "^1.0.11",
     "@types/supertest": "^2.0.7",
+    "@types/is-running": "^2.1.0",
     "chai": "^3.5.0",
     "chai-like": "^0.1.10",
     "cross-env": "^5.2.0",

test/typescript/test-clustered-actor.ts

@@ -9,7 +9,7 @@ import {afterEach} from 'mocha';
 import * as tu from '../../lib/utils/test';
 import * as actors from '../../index';
 import {expect} from 'chai';
-import * as isRunning from 'is-running';
+import isRunning = require('is-running');
 import * as P from 'bluebird';
 import * as _ from 'underscore';
 

test/typescript/test-forked-actor.ts

@@ -10,7 +10,7 @@ import {afterEach} from 'mocha';
 import * as tu from '../../lib/utils/test';
 import * as actors from '../../index';
 import {expect} from 'chai';
-import * as isRunning from 'is-running';
+import isRunning = require('is-running');
 import * as P from 'bluebird';
 import * as _ from 'underscore';
 import * as http from 'http';
@@ -464,6 +464,23 @@ describe('ForkedActor', function() {
       expect(result).to.be.equal('HELLO!');
       expect(localCounter).to.be.equal(1);
     });
+
+    it('should correctly send numeric parameters', async function() {
+      /**
+       * Test actor class.
+       */
+      class TestActor {
+        printNumber(n: number): string {
+          return `${n}`;
+        }
+      }
+
+      let actor = await rootActor.createChild(TestActor, { mode: 'forked' });
+
+      let result = await actor.sendAndReceive('printNumber', 0);
+
+      expect(result).to.be.equal('0');
+    });
   });
 
   describe('send()', function() {

test/typescript/test-remote-actor.ts

@@ -10,7 +10,7 @@ import {afterEach} from 'mocha';
 import * as tu from '../../lib/utils/test';
 import * as actors from '../../index';
 import {expect} from 'chai';
-import * as isRunning from 'is-running';
+import isRunning = require('is-running');
 import * as P from 'bluebird';
 import * as _ from 'underscore';
 

test/typescript/test-threaded-actor.ts

@@ -9,7 +9,7 @@ import {ActorSystem, Actor, ActorRef} from '../../index';
 import {afterEach} from 'mocha';
 import * as actors from '../../index';
 import {expect} from 'chai';
-import * as isRunning from 'is-running';
+import isRunning = require('is-running');
 import * as P from 'bluebird';
 import * as _ from 'underscore';
 import * as common from '../../lib/utils/common.js';
@@ -374,6 +374,23 @@ describe('ThreadedActor', function () {
         expect(result).to.be.equal('HELLO!');
         expect(localCounter).to.be.equal(1);
       });
+
+      it('should correctly send numeric parameters', async function() {
+        /**
+         * Test actor class.
+         */
+        class TestActor {
+          printNumber(n: number): string {
+            return `${n}`;
+          }
+        }
+
+        let actor = await rootActor.createChild(TestActor, { mode: 'threaded' });
+
+        let result = await actor.sendAndReceive('printNumber', 0);
+
+        expect(result).to.be.equal('0');
+      });
     });
 
     describe('send()', function () {