Something weird with F.toString

[TheBojda]

This is my code:

const transactionHash = poseidon([1,2,3,4])
console.log(poseidon.F.toString(transactionHash, 16))
poseidon.F.toRprLE(transactionHash)
console.log(transactionHash)

The result is:

Uint8Array(32) [
  101,   4,  37, 101, 223,  37, 165, 186,
   61, 102, 224,  28, 187,  14, 230,  55,
  152,  11,  81, 228,  64, 250, 206, 157,
  215, 253, 193, 182, 125, 134, 156,  41
]

If I comment out the 2. line (F.toString with the console.log), the result changes to:

Uint8Array(32) [
   55, 101, 196, 198, 129, 138, 140,  45,
  142,  65, 142,  10,  95, 238,   7, 252,
   22,  29,  96,  57, 220, 241,  71, 104,
   73, 180, 227,  41, 211, 150,  75,  39
]

toString should be stateless. Or not?