problem with the creation_before page

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+I have this in my `ikiwiki.setup`:
+
+    comments_closed_pagespec: 'creation_before(comment_forbid_before)'
+
+I was hoping it would forbid comments on pages older than `comment_forbid_before.mdwn`. I created the page, of which you can see a rendering here:
+
+https://anarc.at/comment_forbid_before/
+
+Notice how ikiwiki correctly parsed the `meta` directive to make the page as created about two years ago, as I have put this on top of `comment_forbid_before.mdwn`:
+
+    [[!meta date="2018-04-05"]]
+
+Yet the following page, which gets mysteriously respammed all the time, keeps on getting spammed anyways:
+
+https://anarc.at/blog/2006-07-04-vol-et-ralentissement-de-ce-blog/
+
+I have since them removed the spam, and worked around the problem by doing this configuration instead:
+
+    comments_closed_pagespec: 'creation_before(comment_forbid_before) or creation_year(2006)'
+
+But later pages, "created before" the flag page, still have comments allowed:
+
+https://anarc.at/blog/2017-07-03-free-software-activities-june-2017/
+
+Now I know that I could list every year my blog was in operation until now in that pagespec to workaround this, but I figured it would be nicer to fix this bug.
+
+Alternatively, it would be great to have a `creation_before(2 years ago)` or `creation_older_than(2 years)` to do what I actually want here, which is to keep spam to newer pages, to reduce the attack surface.
+
+Thanks!
+
+-- [[anarcat]]