Method truncate

arrow-buffer/src/builder/mod.rs:316–318

(&mut self, len: usize)

    /// ```
    #[inline]
    pub fn truncate(&mut self, len: usize) {
        self.buffer.truncate(len * std::mem::size_of::<T>());
    }

    /// # Safety
    /// This requires the iterator be a trusted length. This could instead require