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pcntl_alarm() accepts a zend_long (signed) but passes it to alarm(), which takes an unsigned int. Negative values silently wrap to large unsigned values, scheduling an alarm far in the future instead of raising an error.
deduplicated max signals computation by using globals
since it is casted to zend_long, better using add_assoc_long_ex due to loss of precision with add_assoc_double_ex
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