HRS §556-10
What happens when this chapter doesn't cover a case
If this chapter doesn't cover your situation, the usual legal rules still apply—including fairness, business customs, and laws about trusts, agents, checks, and banking. This section just says those general rules continue to work when this chapter is silent.
everyone
The statute, as written — Cases not provided for in chapter
In any case not provided for in this chapter the rules of law and equity, including the law merchant and those rules of law and equity relating to trusts, agency, negotiable instruments, and banking, shall continue to apply.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.