@Override
	public String normalizeValue(String value) {
		if (value != null) {
			if (value.equals("f") || value.equals("false")) {
				return "false";
			}
			if (value.equals("t") || value.equals("true")) {
				return "true";
			}
		}
		return null;
	}
@return false, only one boolean value is allowed
Ghidra/Features/BSim/src/main/java/ghidra/features/bsim/gui/filters/FunctionTagBSimFilterType.java