Method replacen

crates/wtf8/src/lib.rs:1182–1185

(&self, from: &Wtf8, to: &Wtf8, n: usize)

    }

    pub fn replacen(&self, from: &Wtf8, to: &Wtf8, n: usize) -> Wtf8Buf {
        let w = self.bytes.replacen(from, to, n);
        unsafe { Wtf8Buf::from_bytes_unchecked(w) }
    }
}

impl AsRef<Wtf8> for str {