Quat's members can't be constexpr-accessed on MSVC /GLM_LANG_CXXMS_FLAG

[RedYggdrasil]

Hello!

I can't get to do much constexpr math with the glm::quat type on visual studio because member are not constepxr accessible.

constexpr float x = myQuat.x; // do not evaluate to a constant expression
constexpr float y = myQuat[1]; // do not evaluate to a constant expression

Are not constexpr on MSVC because it is defined as a union of a struct and a detail::storage type.
This seems to have been setup something like 8 years ago when I look at the git blame history, and the GLM_LANG_CXXMS_FLAG flag does not seem to do similar things with similar types like vectors.

is this union still strictly necessary in MSVC? Am I missing something important there reguarding alignment on MSVC or other constraints?
Thanks!

glm\detail\type_quat.hpp

	struct qua
	{
		// -- Implementation detail --

		typedef qua<T, Q> type;
		typedef T value_type;

		// -- Data --

#		if GLM_LANG & GLM_LANG_CXXMS_FLAG
			union
			{
#				ifdef GLM_FORCE_QUAT_DATA_WXYZ
					struct { T w, x, y, z; };
#				else
					struct { T x, y, z, w; };
#				endif

				typename detail::storage<4, T, detail::is_aligned<Q>::value>::type data;
			};
#		else
#			ifdef GLM_FORCE_QUAT_DATA_WXYZ
				T w, x, y, z;
#			else
				T x, y, z, w;
#			endif
#		endif
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