Method is_zero

cpp/fory/util/float16.h:68–70

True if the value is +0 or -0.

  // True if the value is +0 or -0.
  [[nodiscard]] static bool is_zero(float16_t h) noexcept {
    return (h.bits & 0x7FFFu) == 0u;
  }

  // True if the sign bit is set (value is negative or negative zero/NaN).
  [[nodiscard]] static bool signbit(float16_t h) noexcept {