US-11: having both "bound" and "extent" is redundant

[sdutoit]

N3733 US-11 says:

Two distinct terms of art, bound and extent, are now used to denote an array’s number of elements. For both consistency and improved technical accuracy, a single term of art should be adopted and used throughout the standard.

It goes on to propose:

Because extent is the user-visible term used in the Library’s interface, its consistent use would avoid breaking existing programs. See the wording proposed in N3549.

[sdutoit]

This issue has been rejected by CWG.