Method set_len

external/include/fast_float/fast_float.h:1714–1716

set the length, without bounds checking.

  // set the length, without bounds checking.
  void set_len(size_t len) noexcept {
    length = uint16_t(len);
  }
  constexpr size_t len() const noexcept {
    return length;
  }