Vulcan/packages/vulcan-ui-bootstrap/lib/components/forms/Number.jsx

import React from 'react';
import { Input } from 'formsy-react-components';
import { registerComponent } from 'meteor/vulcan:core';

const NumberComponent = ({refFunction, inputProperties}) => 
  <Input {...inputProperties} ref={refFunction} type="number" />;

registerComponent('FormComponentNumber', NumberComponent);