What you're referring to in your last sentence is what some call "edge cases". These edge cases, where there may be ambiguity to the reader of the code is where your extremely brief comments should go. Code should document itself, but if you feel the reader may scratch their head:
...
my $x = thing_list(); # href
...
Of course, that's a pretty trivial example, but you get the point.
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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