No closing PHP tag in functions.wp-styles.php and functions.wp-scripts.php

[alexrabe]

Is there a reason why the two files (functions.wp-styles.php and functions.wp-scripts.php) didn't contain a closing ?> for the PHP script ?

No closing ?> tag is the preferred style in most web applications. This prevents accidental whitespace at the end of the file from being output prematurely (before headers and such are sent).

While it's not generally the style in WordPress, it is the recommended style by virtually all of the PHP community.

Actually, the reason is that the two files, as well as two other files are part of BackPress and not of WordPress, which has the convention of including the closing PHP tag.

You may create a ticket at ​http://backpress.automattic.com/ and see what is said there.

This is actually invalid, since it isn't part of WordPress.

Not part of WordPress. See BackPress.