Function floatSafeRemainder

packages/zod/src/v3/types.ts:1354–1361

(val: number, step: number)

// https://stackoverflow.com/questions/3966484/why-does-modulus-operator-return-fractional-number-in-javascript/31711034#31711034
function floatSafeRemainder(val: number, step: number) {
  const valDecCount = (val.toString().split(".")[1] || "").length;
  const stepDecCount = (step.toString().split(".")[1] || "").length;
  const decCount = valDecCount > stepDecCount ? valDecCount : stepDecCount;
  const valInt = Number.parseInt(val.toFixed(decCount).replace(".", ""));
  const stepInt = Number.parseInt(step.toFixed(decCount).replace(".", ""));
  return (valInt % stepInt) / 10 ** decCount;
}

export interface ZodNumberDef extends ZodTypeDef {
  checks: ZodNumberCheck[];