Checks if parameter a equals parameter b and returns input c, otherwise input d is returned. The check depends on data types of parameters a and b.

If both arguments are of type String, a String comparison is performed.

If one argument is of type Boolean, the other one will be converted to a Boolean and a Boolean comparison is done. In all other cases, a numeric comparison will be performed using BigDecimal.

Dates and timestamps are converted to 'Unix time', i.e. the number of milliseconds since 1970-01-01 00:00:00 in order to compare the numerically.