When 'x' is an integral arithmetic expression, it's now coerced to
yield a signed integer before taking the absolute value of it to
prevent the common issue of unsigned integer overflow/wraparound for
values below zero.
Using a time or interval value/expression for 'x' now also yields a
time or interval, respective, from the |x| operation instead of
a double.
Added tests of all built-in Bro data types (including different
representations of constant values, and max./min. values), keywords, and
operators (including special properties of certain operators, such as
short-circuit evaluation and associativity).
