libxmljs memory leak

proof.js

const libxmljs = require('libxmljs')

const doc = new libxmljs.Document()

const measure = () => {
  global.gc()
  return process.memoryUsage()
}

const run = () => {
  const el = new libxmljs.Element(doc, 'Node')
  el.text('foobarbaz')
  el.text('')
}

console.time('warmup')
for (let i = 0; i < 2000000; ++i) {
  run()
}
console.timeEnd('warmup')

const before = measure()
console.log('before:', before)
for (let i = 0; i < 2000000; ++i) {
  run()
}
const after = measure()
console.log('after: ', after)