ikegami,

From what I remember, it was an issue for me only twice in the past.

• 1) When running a system wide test harness on independent subsystem test scripts.
• 2) While executing scripts using require or do like you stated above

Anyway, both were very obscure cases that haven't come up again, and both could be worked around using alternative methods of course. Nevertheless, I still use the __FILE__ out of habit now.