On: Which JavaScript property names can be unquoted? When can dot notation be used?

Possbily, I'll try to dig up something from my old projects. I wouldn't be surprised if I seem to be misinformed about it a little.

You may have been thinking of ES3, which disallowed the use of unquoted reserved words as property names. So yeah, quoting is still a good idea, especially if backwards compatibility is a concern.