fix: Allow 0 as a value for temperature, topP, etc.

[ejunker]

Description

The buildPayload() methods are using array_filter() without a callback which will remove any falsey values such as the literal 0 value. This is a problem if you want to set your temperature to 0 or your topP to 0 because those values will be filtered out. The code was updated to provide a callback that checks for null values explicitly.

[ejunker]

I just noticed this same problem also exists in the main prism-php/prism repo.

And Laravel has a Arr::whereNotNull($array); helper if you want to use that instead of the array_filter()

[ChrisB-TL]

Good catch! Would you mind adding an HTTP test to make sure a zero value is sent, to prevent future regressions?

See example on another PR here: 8abecee

[ejunker]

@ChrisB-TL Would a test like this be suitable? I tried using Prism::fake() but then the buildPayload() method is not called.

it('removes null values from payload', function (): void {
    FixtureResponse::fakeResponseSequence('converse', 'converse/structured');

    $schema = new ObjectSchema(
        'output',
        'the output object',
        [
            new StringSchema('weather', 'The weather forecast'),
            new StringSchema('game_time', 'The tigers game time'),
            new BooleanSchema('coat_required', 'whether a coat is required'),
        ],
        ['weather', 'game_time', 'coat_required']
    );

    Prism::structured()
        ->withSchema($schema)
        ->using('bedrock', 'anthropic.claude-3-5-haiku-20241022-v1:0')
        ->withProviderOptions([
            'apiSchema' => BedrockSchema::Converse,
            'guardRailConfig' => null,
        ])
        ->withMaxTokens(2048)
        ->usingTemperature(0)
        ->asStructured();

    Http::assertSent(function (Request $request) {
        return expect($request->data())->toMatchArray([
            'inferenceConfig' => [
                'maxTokens' => 2048,
                'temperature' => 0,
            ],
        ])->not()->toHaveKey('guardRailConfig');
    });
});