test: assert rating as a json number across json-streamer versions

[soyuka]

Fixes the PHPUnit (PHP 8.3) (Symfony lowest) job, which #8461 broke.

What broke

#8461 adapted the rating assertions to json-streamer 8.1.4, which encodes with JSON_PRESERVE_ZERO_FRACTION:

$this->assertIsFloat($res['rating']);
$this->assertSame(0.0, $res['rating']);

That pins the test to >= 8.1.4. The Symfony lowest job runs composer update --prefer-lowest, which resolves an earlier json-streamer that encodes an integral float as 5:

1) JsonStreamerTest::testJsonStreamerJsonLd
Failed asserting that 5 is of type float.
2) JsonStreamerTest::testJsonStreamerJson
Failed asserting that 4 is of type float.

Symfony lowest was green on e22463fdb and red from e3cb2da6c (#8461), so this is a clean regression rather than a pre-existing condition.

Fix

The PHP type of a decoded JSON number is an encoder detail that varies by version; the assertion should not depend on it. Assert that it is a JSON number of either type:

// json-streamer only encodes with JSON_PRESERVE_ZERO_FRACTION since 8.1.4, so an integral
// float decodes as int on lower versions
$this->assertTrue(\is_int($res['rating']) || \is_float($res['rating']));

and compare the write-path value loosely (assertEquals(0, ...)) so 0 and 0.0 both satisfy it. views (a real int) and price (a string) keep their strict assertions.

Verification

Reproduced the failure locally by downgrading to json-streamer 8.1.2 — the assertions on 4.3 fail exactly as CI reports:

Failed asserting that 4 is of type float.
Failed asserting that 3 is of type float.
Failed asserting that 0 is identical to 0.0.

With this change, phpunit tests/Functional --filter JsonStreamer passes under both json-streamer 8.1.2 and 8.1.4 (7 tests, 41 assertions, 1 skipped). composer.json restored afterwards; only the test file changes.