Option to make filenames case-insensitive

[eknirk]

Summary

It would be great if an option could be added that prevents filenames that are only different in their case. For example, all filenames can be converted to lowercase.

Context

Currently, the filenames can be the same except for their case when the underlying filesystem is case sensitive. If such filenames exist, further handling of the downloaded files can be complicated.

In my case, the downloaded files are synced to a case-insensitive file system and the synchronisation breaks for such filenames.