find_postfixes_with_current proposal

[allevo]

Hi!
I'd like to add a new feature to have back if there's an exact match and the postfix in one call.
This is useful to distinguish what match exaclty from what don't.
Something like

    pub fn find_postfixes_with_current<I: Iterator<Item = K>>(&self, prefix: I) -> (Option<&V>, Vec<&V>) {
        let mut postfixes = Vec::new();
        let mut exact = None;
        if let Some(node) = self.find_node(prefix) {
            exact = node.value.as_ref();
            for (_, child) in &node.children {
                self.collect_values(child, &mut postfixes);
            }
        }
        (exact, postfixes)
    }

Anyway, before sending a PR, I would like to know if:

• you are interested in this feature
• you like the interface