This reverts a bit of the work @willnorris had made to support
extensionless permalinks. Using the ‘permalink’ front matter will no
longer work as it must allow non-html extensions to be written.
Post#url wasn't escaped at all.
For example, when we have a page named 'a#b.html',
we expect its url to be 'a%23b.html',
but it was actually 'a#b.html'.
We now use Jekyll::URL.escape_path and Jekyll::URL.unescape_path.
Parker Moore
ChaYoung You
nitoyon
Anand Narayan