protected void checkDup(String name) {
		if (valuesMap.containsKey(name)) {
			throw new IllegalArgumentException("value already exits named " + name);
		}
	}
Sets the String value for the given name.
@param name the name of the String value that was previously defined
@param value the String to set as the value
@throws IllegalArgumentException if the name hasn't been defined as a String type
Ghidra/Framework/Docking/src/main/java/docking/widgets/values/GValuesMap.java