Method SetNull

src/ObjectModel/ObjectModel.h:152–152

	void SetStringHandle(StringHandle sh) noexcept { Release(); type = (uint32_t)TypeCode::HeapString; shVal = sh; }
	void SetArrayHandle(ArrayHandle ah) noexcept { Release(); type = (uint32_t)TypeCode::HeapArray; ahVal = ah; }
	void SetNull(std::nullptr_t dummy) noexcept { Release();  type = (uint32_t)TypeCode::None; }
	void SetDateTime(time_t t) noexcept { Release(); type = (uint32_t)TypeCode::DateTime_tc; Set56BitValue(t); }

	void SetUnsigned(uint32_t u) noexcept { Release(); type = (uint32_t)TypeCode::Uint32; uVal = u; }