Check if a weight is a variable weight.
Source position: unicodedata.pas line 434
| function TUCA_DataBook.IsVariable( | 
| const AWeight: PUCA_PropWeights | 
| ):Boolean; | 
| AWeight | 
 | Weight to check. | 
True if the weight is in the variable range.
IsVariable checks whether AWeight is between the VariableLowLimit and VariableHighLimit limits.