Recognizer predicates for number types

There are recognizer procedures which can be applied to any object and will always return a boolean (true or false) result.

isinteger(ITEM)
        Returns <true> if ITEM is a simple integer, <false> otherwise.

isbiginteger(ITEM)
        Returns <true> if ITEM is a biginteger, <false> otherwise.

isintegral(ITEM)
        Returns <true>  if ITEM  is a  simple integer  or a  biginteger,
        <false> otherwise.

isratio(ITEM)
        Returns <true> if ITEM is a ratio, <false> otherwise.

isrational(ITEM)
        Returns <true> if ITEM  is a simple  integer, a biginteger  or a
        ratio, and <false> otherwise.

isdecimal(ITEM)
        Returns <true>  if ITEM  is  a decimal  or a  ddecimal,  <false>
        otherwise.

issdecimal(ITEM)
        Returns <true>  if  ITEM is  a  single length  decimal,  <false>
        otherwise.

isddecimal(ITEM)
        Returns <true> if ITEM is a ddecimal, <false> otherwise.

isreal(ITEM)
        Returns <true> if ITEM is  any number except a complex,  <false>
        otherwise.

iscomplex(ITEM)
        Returns <true> if ITEM is a complex number, <false> otherwise.

isnumber(ITEM)
        Returns <true> if ITEM is any kind of number, <false> otherwise.