HashMap can't delete the null items

Developers
1

source code

source code

Key is Principal:

import HashMap "mo:base/HashMap";
import Principal "mo:base/Principal";

actor Example {
    var map = HashMap.HashMap<Principal, Nat>(1, Principal.equal, Principal.hash);

    public func example(i: Principal) {
        map.delete(i);
    };
};

Key is Nat:

import HashMap "mo:base/HashMap";
import Hash "mo:base/Hash";
import Nat "mo:base/Nat";

actor Example {
    var map = HashMap.HashMap<Nat, Nat>(1, Nat.equal, Hash.hash);

    public func example(i: Nat) {
        map.delete(i);
    };
};

log

call logout

Key is Principal:

➜  temp git:(master) ✗ sudo dfx canister call  test example '(principal "ryjl3-tyaaa-aaaaa-aaaba-cai")'
The Replica returned an error: code 5, message: "Canister ryjl3-tyaaa-aaaaa-aaaba-cai trapped explicitly: bigint function error"
➜  temp git:(master) ✗ sudo dfx canister call  test example '(principal "as74e-clvxo-uxwuz-5dn2d-mqv2o-cwziv-iiemi-ckej2-yfwu6-zmj5u-mae")'
The Replica returned an error: code 5, message: "Canister ryjl3-tyaaa-aaaaa-aaaba-cai trapped: integer division by 0"

Key is Nat:

➜  temp git:(master) ✗ sudo dfx canister call  test example '(0)'
The Replica returned an error: code 5, message: "Canister ryjl3-tyaaa-aaaaa-aaaba-cai trapped: integer division by 0"
➜  temp git:(master) ✗ sudo dfx canister call  test example '(1)'
The Replica returned an error: code 5, message: "Canister ryjl3-tyaaa-aaaaa-aaaba-cai trapped: integer division by 0"
➜  temp git:(master) ✗ sudo dfx canister call  test example '(2)'
The Replica returned an error: code 5, message: "Canister ryjl3-tyaaa-aaaaa-aaaba-cai trapped explicitly: bigint function error"
➜  temp git:(master) ✗ sudo dfx canister call  test example '(3)'
The Replica returned an error: code 5, message: "Canister ryjl3-tyaaa-aaaaa-aaaba-cai trapped: integer division by 0"
➜  temp git:(master) ✗ sudo dfx canister call  test example '(4)'
The Replica returned an error: code 5, message: "Canister ryjl3-tyaaa-aaaaa-aaaba-cai trapped explicitly: bigint function error"
➜  temp git:(master) ✗ sudo dfx canister call  test example '(5)'
The Replica returned an error: code 5, message: "Canister ryjl3-tyaaa-aaaaa-aaaba-cai trapped explicitly: bigint function error"

I looked for similar log case, and it is caused by different reasons: