Rich Relations

The "rich" comparison special methods often return a bool. However, instances of any type can be returned (e.g. a numpy array). This is why the corresponding optype.Can* interfaces accept a second type argument for the return type, that defaults to bool when omitted. The first type parameter matches the passed method argument, i.e. the right-hand side operand, denoted here as x.

operator				operand
expression	reflected	function	type	method	type
`_ == x`	`x == _`	`do_eq`	`DoesEq`	`__eq__`	`CanEq[-T = object, +R = bool]`
`_ != x`	`x != _`	`do_ne`	`DoesNe`	`__ne__`	`CanNe[-T = object, +R = bool]`
`_ < x`	`x > _`	`do_lt`	`DoesLt`	`__lt__`	`CanLt[-T, +R = bool]`
`_ <= x`	`x >= _`	`do_le`	`DoesLe`	`__le__`	`CanLe[-T, +R = bool]`
`_ > x`	`x < _`	`do_gt`	`DoesGt`	`__gt__`	`CanGt[-T, +R = bool]`
`_ >= x`	`x <= _`	`do_ge`	`DoesGe`	`__ge__`	`CanGe[-T, +R = bool]`