****
This abstraction models the concept of any value class
which is an immutable class but the values of which are not necessarily ordered.
Ancestors
$NIL
$IS_NIL
$IS_EQ
Descendants
$ORDERED{_}
TIMES
UNICODE
ELAPSED
CHAR_CODE
ANGLED
TIME_STAMP
$CHAR{_}
CHAR
RUNE
ORDER_WEIGHT
ANGLE
$DATES{_}
ERA_DATES
DATES
$NFE{_}
MONEY
$ARITHMETIC{_}
$COMPLEX{_,_}
CPXD
CPX
$RATIONAL{_}
RAT
$REAL{_}
FLTD
FLT
$SIMPLE_NUM{_}
$WHOLE_NUM{_}
INTI
$CARDINAL{_}
$INTEGER{_}
INT
FIELD
CARD
Public
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