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I have been looking into 32-bit or 64-bit Android versions for phones. It seems to me that the information on the number of bits of the installed Android version is always missing from phones' specs, unlike what happens for the CPU. Googling around, the ways I have found to understand whether a phone is running a 32-bit or a 64-bit OS all include actually doing something with the phone, like looking up the kernel version or downloading some app, like AIDA64.
How do I know if a phone I want to buy will come with a 32-bit or a 64-bit Android before I buy it? It would be interesting to find a layman-friendly criterion or resource that allows me to know this in advance, especially to be able to look into the cheapest phones running a 64-bit Android.