# Among

Among a set of values

## Signature

among(val: Alpha|AttrName, vals: Set<Alpha>) -> Predicate

## Examples
among(:status, [10, 30])

## Description

This predicates checks whether `val` belongs to the set of values `vals`.

## Implementation notes

The set `vals` may only contain pure values, attribute names are not
supported. Any enumerable of such values is supported in practice, e.g.
an Array literal.