bugfix: use BigInteger for balances

src/Module/Accounts/Accounts.php

@@ -25,7 +25,7 @@ public function __construct(private readonly EtherscanClient $client) {}
     /**
      * @see https://docs.etherscan.io/api-endpoints/accounts#get-ether-balance-for-a-single-address
      */
-    public function getBalance(string $address, AccountBalanceTag $tag = AccountBalanceTag::LATEST): string
+    public function getBalance(string $address, AccountBalanceTag $tag = AccountBalanceTag::LATEST): BigInteger
     {
         $params = [
             'tag' => $tag->value,
@@ -36,7 +36,7 @@ public function getBalance(string $address, AccountBalanceTag $tag = AccountBala
         /** @var array{result: string} $json */
         $json = json_decode($response->getBody()->getContents(), true);
 
-        return $json['result'];
+        return new BigInteger($json['result'], 16);
     }
 
     /**
@@ -58,7 +58,7 @@ public function getBalances(array $addresses, AccountBalanceTag $tag = AccountBa
          * }>} $json */
         $json = json_decode($response->getBody()->getContents(), true);
 
-        return array_map(fn(array $balance): Balance => new Balance($balance['account'], $balance['balance']), $json['result']);
+        return array_map(fn(array $balance): Balance => new Balance($balance['account'], new BigInteger($balance['balance'], 16)), $json['result']);
     }
 
     /**

src/Module/Accounts/Model/Balance.php

@@ -4,10 +4,12 @@
 
 namespace seregazhuk\EtherscanApi\Module\Accounts\Model;
 
+use phpseclib3\Math\BigInteger;
+
 final class Balance
 {
     public function __construct(
         public readonly string $account,
-        public readonly string $balance,
+        public readonly BigInteger $balance,
     ) {}
 }

tests/Module/AccountsTest.php

@@ -58,7 +58,7 @@ public function it_retrieves_account_balance(): void
             ->willReturn(new Response(200, [], $json));
 
         $balance = $this->accounts->getBalance('0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae');
-        $this->assertSame('40891626854930000000000', $balance);
+        $this->assertTrue((new BigInteger('40891626854930000000000', 16))->equals($balance));
     }
 
     #[Test]
@@ -129,9 +129,9 @@ public function it_retrieves_accounts_balances(): void
         $balances = $this->accounts->getBalances(['0xddbd2b932c763ba5b1b7ae3b362eac3e8d40121a', '0x63a9975ba31b0b9626b34300f7f627147df1f526']);
         $this->assertCount(2, $balances);
         $this->assertSame('0xddbd2b932c763ba5b1b7ae3b362eac3e8d40121a', $balances[0]->account);
-        $this->assertSame('27000616846559600000999', $balances[0]->balance);
+        $this->assertTrue((new BigInteger('27000616846559600000999', 16))->equals($balances[0]->balance));
         $this->assertSame('0x63a9975ba31b0b9626b34300f7f627147df1f526', $balances[1]->account);
-        $this->assertSame('2039670355000', $balances[1]->balance);
+        $this->assertTrue((new BigInteger('2039670355000', 16))->equals($balances[1]->balance));
     }
 
     #[Test]