drain

    fn drain(w: *Writer, data: []const []const u8, splat: usize) Io.Writer.Error!usize {
        const sew: *StringEscapeWriter = @alignCast(@fieldParentPtr("writer", w));
        const out = sew.out;
        try stringEscape(w.buffered(), out);
        w.end = 0;
        var n: usize = 0;
        for (data[0 .. data.len - 1]) |bytes| {
            try stringEscape(bytes, out);
            n += bytes.len;
        }
        const pattern = data[data.len - 1];
        for (0..splat) |_| {
            try stringEscape(pattern, out);
            n += pattern.len;
        }
        return n;
    }