defuFn return wrong expected value while there have multiple default

[byronogis]

Environment

node -v
v22.11.0

Reproduction

See Describe the bug

Describe the bug

import { defuFn } from 'defu'

const filterDist = (val: string[]) => val.filter(i => i !== 'dist')
const addTwenty = (val: number) => val + 20
const addTen = (val: number) => val + 10

const res = defuFn(
  {
    count: addTwenty,
    num: addTen,
    items: filterDist,
  },
  {
    count: 10,
    num: 5,
    items: ['node_modules', 'test'],
  },
  {
    count: 5,
    num: 3,
    items: ['temp', 'dist'],
  },
)

console.dir({ res }, { depth: 5 })

// expected: 
/*
{
  res: {
    count: 30,
    num: 15,
    items: [ "node_modules", "test", "temp"]
  }
}
*/

// received: 
/*
{
  res: {
    count: 30,
    num: 15,
    items: [ "node_modules", "test", "temp", "dist" ]
  }
}
*/

Additional context

When entering the second loop, the function has already been replaced with a value

defu/src/defu.ts

Line 53 in 70cffe5

arguments_.reduce((p, c) => _defu(p, c, "", merger), {} as any);

Logs

No response

[byronogis]

Maybe this is a idea.

// createDefu
_defu(
  arguments_[0],
  arguments_.slice(1).reduce((p, c) => _defu(p, c, "", merger), {} as any),
    "",
  merger,
)