PHP 8.5: NAN coercion warnings

[swissspidy]

Parent ticket for all things PHP 8.5: #63061

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These are new warnings when testing against PHP 8.5. Should probably add some is_nan() checks or remove the edge case tests.

2) Tests_Media::test_wp_convert_bytes_to_hr
The float NAN is not representable as an int, cast occurred

/var/www/src/wp-includes/deprecated.php:3374
/var/www/tests/phpunit/tests/media.php:498
/var/www/vendor/bin/phpunit:122

9) Tests_Option_WpPrimeOptionCaches::test_get_option_should_return_identical_value_when_pre_primed_by_wp_prime_option_caches with data set "NAN" (NAN)
unexpected NAN value was coerced to string

/var/www/src/wp-includes/class-wpdb.php:1763
/var/www/src/wp-includes/option.php:1143
/var/www/tests/phpunit/tests/option/wpPrimeOptionCaches.php:251
/var/www/vendor/bin/phpunit:122

Trac ticket: https://core.trac.wordpress.org/ticket/64047

[swissspidy]

In 60811:

Code Modernization: Avoid NAN coercion/cast deprecation warnings.

Coercing INF or NAN to a string or casting to int is deprecated in PHP 8.5+.

This change addresses two occurrences in core where this was happening.

Props swissspidy.
Fixes #64047. See #63061.