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Why value length varies? Can I set a fixed length?

If I generate multiple ids, some have different lengths.

Can I set the length to a fixed number?

$list = [];
foreach (range(0, 10) as $i) {
  $uid = SmallUid::random();
  $val = (string)$uid;
  $hex = (string)$uid->toHex();
  $list[] = ['val' => $val, 'hex' => $hex, 'len' => strlen($val)];
}

In this case, the length of the first value is 10, while the others is 11:

[
  [
    "val" => "QvgsOfS1x3",
    "hex" => "185cb8707fd2f050",
    "len" => 10,
  ],
  [
    "val" => "19YmwgRJ5jl",
    "hex" => "185cb8707fd917d0",
    "len" => 11,
  ],
  [
    "val" => "KmgTohaPbzF",
    "hex" => "185cb8707fd3912f",
    "len" => 11,
  ],
  [
    "val" => "1aosJi8Frgv",
    "hex" => "185cb8707fd90921",
    "len" => 11,
  ],
  [
    "val" => "LuPBmpmAZwP",
    "hex" => "185cb8707fd523ff",
    "len" => 11,
  ],
  [
    "val" => "BKi8xxXjevB",
    "hex" => "185cb8707fdc3048",
    "len" => 11,
  ],
  [
    "val" => "I4uVEA8Mn4r",
    "hex" => "185cb8707fd6492d",
    "len" => 11,
  ],
  [
    "val" => "BWFmtfbp2PJ",
    "hex" => "185cb8707fdee268",
    "len" => 11,
  ],
  [
    "val" => "FkU5aXrL0Ur",
    "hex" => "185cb8707fd7277b",
    "len" => 11,
  ],
  [
    "val" => "A1Xajyi4a6T",
    "hex" => "185cb8707fd04c47",
    "len" => 11,
  ],
  [
    "val" => "6JSFSjzUfs9",
    "hex" => "185cb8707fd6a894",
    "len" => 11,
  ],
]

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