Generalize verify integers check

Fixes #1416

src/public/Terminal.ts

@@ -178,8 +178,8 @@ export class Terminal implements ITerminalApi {
 
   private _verifyIntegers(...values: number[]): void {
     values.forEach(value => {
-      if (value % 1 !== 0) {
-        throw new Error('This API does not accept floating point numbers');
+      if (value === Infinity || value === NaN || value % 1 !== 0) {
+        throw new Error('This API only accepts integers');
       }
     });
   }