ORDER BY the IN value list

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I have a simple SQL query in PostgreSQL 8.3 that grabs a bunch of comments. I provide a sorted list of values to the IN construct in the WHERE clause:

SELECT * FROM comments WHERE (comments.id IN (1,3,2,4));

This returns comments in an arbitrary order which in my happens to be ids like 1,2,3,4.

I want the resulting rows sorted like the list in the IN construct: (1,3,2,4).
How to achieve that?

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