This summary is not the rule. The rule text controls.
Here's what this rule means in plain terms:
This law doesn't stand entirely on its own. General legal principles that courts have used for a long time still apply, unless this specific law says otherwise. These general principles fill in the gaps.
For example, basic rules about contracts still count. This includes whether someone had the legal ability to make a deal, how agents can act on behalf of others, and what happens when someone relies on another person's promise. It also covers situations involving fraud, lies, threats, force, honest mistakes, or bankruptcy.
In short, this law works together with older, well established legal rules. If this specific law doesn't address a situation directly, courts will look to these traditional principles to decide what's fair and legal. This helps make sure people can't use tricks, threats, or dishonesty to get around the law, and it protects people who lack the ability to fully understand or agree to a contract.