Danny Robson 35e3f69ad2 maths, view: rationalise equal,almost_equal,==
views should not do elementwise comparisons for equality operators.
they are pairs of iterators and are only equal if their iterators are
equal.

instead, use `equal` for elementwise equality. we update the name of
exactly_equal to perform this operation too.
2018-01-31 19:33:42 +11:00
..
2017-05-23 12:50:51 +10:00