quilljs/quill — pull request #253 by thomsbg (2014-11-18 17:51:00+00:00)
Title: Ignore unknown formats present in the delta but not configured for the doc

Allow formats to be present in a delta (such as `{ author: 1 }`), but not configured on the quill instance (e.g. you didn't enable the authorship module).

This allows for a single rich-text document to be used in different contexts, with different quill options and modules, without breaking.