Some pasted content crashes editor

[aduth]

Steps to Reproduce

1. Copy a couple paragraphs of text from http://lipsum.com/feed/html
2. Paste into a new Gutenberg > New Post post text block

Expected Behavior

Content is pasted.

Current Behavior

Editor crashes.

Uncaught TypeError: text.replace is not a function

(Note this is a core file, but the same error does not occur in the current post editor)

Possible Solution

It's not yet clear to me whether there are hidden characters in the text that are causing issues. Pasting it into a plain text editor, then re-copying, then pasting into editor works as expected.

[nb]

I hit this one, too – text is an array of React elements, instead of the expected string.