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Sorry, that is supposed to be:

ddoc = {
validates: [
{
match: function(document) { return document.type == 'user'; }
validate: function(new_doc, old_doc, user_context) {
if (!user_context.admin || old_doc.username == user_context.username)
throw 'forbidden', ...;
}
}
]
}

And you'd go from top to bottom calling match, and if match returned true,
call validate.