Re: %-escapes in file URL

[Richard Stallman]

    A simple and natural policy is to always keep URLs in escaped forms,
    whether or not they are used inside Emacs only.  So, my proposal is as
    follows:

      * Always treat URLs as those in escaped form.  Don't re-escape or
        unescape them as long as they are URLs (i.e, have a prefix such as
        "file://").  Increasing the kind of escaped characters is not
        re-escaping.

      * When creating a URL from a file name, encode the file name with
        the file name coding system and then %-escape it.

      * When creating a file name from a URL, %-unescape the URL and then
        decode it with the file name coding system.

Do people agree with that proposal?

What changes are needed to implement it?