Leads to memory leaks when it's used with renderToString

[alexpermiakov]

My react app is server-side rendered. I used NodeJS process.memoryUsage() function for a profiling a rendering process and noticed that after calling renderToString memory never released.

After removing this string: <DocumentTitle title={title} /> GC is able to utilize a memory.

[bhurlow]

I can confirm using react-document-title in our server-side rendered app was also causing memory leak issue

[bhurlow]

this is document here: https://github.com/gaearon/react-side-effect#api