Function write 

pub fn write<W: Write, V: Integer>(writer: W, value: V) -> Result<usize>

Available on crate feature std only.

Write integer to an io::Write

Note that this operation may be slow because it writes the value to stack memory, and then copy the result into writer. You should use write_to_vec or write_to_string if possible.

This function is for compatibility with itoa crate and you should use write_to_vec or write_to_string if possible.