comment is incomplete sentence and doesn't make sense

[wtholliday]

In _swizzle.hpp

// Use an opaque buffer to *ensure* the compiler doesn't call a constructor.
		// The size 1 buffer is assumed to [be] aligned to the actual members so that the
		// elem() [returns the Nth element as expected?]

so that the elem() is what?

Mistaken search-and-replace perhaps?