You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/boa/core/engine/src/builtins/escape
    
    the code of the file until where you have to start completion: //! Boa's implementation of ECMAScript's string escaping functions.
//!
//! The `escape()` function replaces all characters with escape sequences, with the exception of ASCII
//! word characters (Aâ€“Z, aâ€“z, 0â€“9, _) and @*_+-./.
//!
//! The `unescape()` function replaces any escape sequence with the character that it represents.
//!
//! More information:
//!  - [ECMAScript reference][spec]
//!
//! [spec]: h
    
    fn peek_n(&mut self, count: usize) -> &[I::Item] {
        if count <= self.buffered_end {
            return &self.buffer[..count];
        }
        for _ in 0..(count - self.buffered_end) {
            let Some(next) = self.iterator.next() else {
                return &self.buffer[..self.buffered_end];
            };
            self.buffer[self.buffered_end] = next;
            self.buffered_end += 1;
        }

        &self.buffer[..count]
    }