Method set_len

app/src/ThirdParty/fast_float.h:3471–3473

set the length, without bounds checking.

  // set the length, without bounds checking.
  FASTFLOAT_CONSTEXPR14 void set_len(size_t len) noexcept {
    length = uint16_t(len);
  }

  constexpr size_t len() const noexcept { return length; }