default boolean canSpecifyLength() {
		return false;
	}
Determine if the length may be specified for an instanceof this 
datatype (e.g., {@link Data}, {@link Array}, {@link DataTypeComponent}, etc.).
@return true if a user-specified length can be used, else false
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/Dynamic.java