Keep Summary field deployed I'm using the node's Summary field for article teasers. Although not mandatory, this field is being constatly populated by content editors for article content types. I'm trying to make it visible instead of Drupal's default collapsed state, but I've hit a wall on identifying the related JS function and how to modify it without hacking core files.

Any idea on achieving the desired UI modification?

EDIT: OK, seems like the /modules/text/text.js is the file in charge of adding the link that shows/hides the Summary field. 

Since I don't want to simply comment out or edit core files, I think I'll have to make a custom module to unset this js file and not allow it to be loaded. I'm no JS expert but by looking into the code it seems to me that this file impacts only the text summary. Hence my updated question would be:  are there any side effects to unset this file?
For the default value for the field (under Field Settings), in the "Summary" field, you can put a blank " ". This will force the summary field to show up. If you want to do it the correct way, then you will have to check the Javascript that shows/hides the field.