Wrong calculation in unitToPlanck for numbers < 1

[Tbaut]

Here 1 with 9 time 0, and a precision of 10, returns 1 with 9 times 0. Although it should return "0.1"
planckToUnit(1000000000, 10).toLocaleString('en') return 1,000,000,000 although it should return

Got some better results with the following, but I'd advise to look online for something battletested, no need to reinvent it:

export const planckToUnit = (val: bigint, units: number): number => {
  if (units < 0) {
    throw new Error(`Argument out of range: ${units}`)
  }

  const str = val.toString().padStart(units + 1, '0')
  //                               ^^^^^^^^^
  const numb = str.slice(0, -units)
  const dec = str.slice(-units)
  const result = Number(numb + '.' + dec)
  const res = !isNaN(result) ? result : 0
  return res
}

[Tbaut]

BTW toLocaleString('en') is also not helping bc it shows 0 when we get smaller than 0.00001. So I'll remove that in Delegit