4 ms·Only because they're not used. If you're not going to implement the spec then is it really a spec?by maxk42 2y agoOnly because they're not used. If you're not going to implement the spec then is it really a spec?SkiFire13 2y agoIt could also be argued that they aren't used because not all major compilers implement them.bluGill 2y agoIf there was demand major compilers would implement them. That is why despite being difficult all major compilers are working on getting modules working.