Numeric IDs for User

Hello everyone, I noticed that a query listing my users returns numeric IDs for the User entity. While other entities have string IDS (e.g. boards, items). Do you know the reason of this difference of results ?

My query for users:
query {
users {
id
name
email
}
}

returns the following:

{
“data”: {
“users”: [
{
“name”: “Gianluigi Rubino”,
“id”: 10124622,
“email”: “XXXX”
}
],
“complexity”: {
“before”: 10000000,
“query”: 3010,
“after”: 9996990
}
},
“account_id”: 000000
}