`stringstream` allocates uninitialized Buffers when number is passed in input stream on Node.js 4.x and below

I would like to report n uninitialized Buffer allocation issue in `stringstream`. It allows to extract sensitive data from uninitialized memory or to cause a DoS by passing in a large number, in setups where typed user input can be passed to the stream (e.g. from JSON), on Node.js 4.x and lower.

var stringstream = require('stringstream')
var stream = stringstream('hex', 'utf8')
stream.pipe(process.stdout)
stream.write(10000);
stream.end();