The arithmetic comparisons are more flexible than the lexical
comparisons. They are defined for integers, floats and decimals.
For decimals comparison across scales is supported. The same
widening as already defined for the basic operations applies as
well:

1 < 2

1.0 < 2.0

0d1.00D < 2

1 =:= 0d1.00

We also provide evaluable functions min/2 and max/2. These
functions are based on the aforementioned arithmetic comparison.
They always return a value that belongs to the widening type of
both arguments:

min, max: integer x integer -> integer

min, max: float x float -> float

min, max: decimal x decimal -> decimal

The following built-in predicates are provided for arithmetic comparison. The built-ins arithmetically evaluate their arguments before performing their tests:

- X =:= Y: [ISO 8.7.1]

- Succeeds when X arithmetically equals Y, otherwise fails.
- X =\= Y: [ISO 8.7.1]
- Succeeds when X does not arithmetically equal Y, otherwise fails.
- X < Y: [ISO 8.7.1]
- Succeeds when X is arithmetically less than Y, otherwise fails.
- X =< Y: [ISO 8.7.1]
- Succeeds when X is arithmetically less or equal to Y, otherwise fails.
- X > Y: [ISO 8.7.1]
- Succeeds when X is arithmetically greater than Y, otherwise fails.
- X >= Y: [ISO 8.7.1]
- Succeeds when X is arithmetically greater or equal to Y, otherwise fails.

The following evaluable functions are provided for arithmetic
comparison:

- min(X, Y): [TC2 9.3.9]
- If X and Y are both numbers then the function returns the minimum of X and Y.
- max(X, Y): [TC2 9.3.8]
- If X and Y are both numbers then the function returns the maximum of X and Y.