Description:
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This is fairly straightforward.  Right now, native numeric types are float/doubles and 32-bit integers.

Given that > 4GB of memory in a machine is affordable even for the home consumer, it is important to be able to represent exact cardinal values without any floating-point nonsense.

I don't know how much impact this would have the internals of Zend, or performance for that matter.  Non-64-bit-native CPUs could probably adopt optimisations to avoid having to do 64-bit operations on values / expressions where the values are not expected to exceed 32 bits of value, or perhaps, via "type-hinting" by the programmer.

I realise that "bcmath" stuff can handle an effectively infinitely large integer value... but that's really a string-math subsystem with all of the usual limitations (and performance costs).