Trait containing an implicit conversion that adds a +- method to Numeric types, which enables
spreads to be expressed in terms of a pivot and tolerance.
For example, the TripleEquals trait (and its type-checking siblings TypeCheckedTripleEquals and
ConversionCheckedTripleEquals) enable you to write:
a === (1.0 +- 0.1)
Wrapper class with a +- method that, given a Numeric argument, returns a Spread.
Wrapper class with a +- method that, given a Numeric argument, returns a Spread.
Implicitly converts an object of a Numeric type to a PlusOrMinusWrapper,
to enable a +- method to be invoked on that object.
Implicitly converts an object of a Numeric type to a PlusOrMinusWrapper,
to enable a +- method to be invoked on that object.