From my high school chemistry, I suspect that if you are boiling stuff with alcohol in it, you're going to be cooking the alcohol off first and then boiling just the water. This is how fractional distillation works-- the solution will first boil at 173F until all the alcohol is gone, and then heat up to 212F. So, you will probably end up with rum-flavored boba with little or no alcohol content. (Yeah, less science than the first reply, but there you go...)
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From my high school chemistry, I suspect that if you are boiling stuff with alcohol in it, you're going to be cooking the alcohol off first and then boiling just the water. This is how fractional distillation works-- the solution will first boil at 173F until all the alcohol is gone, and then heat up to 212F. So, you will probably end up with rum-flavored boba with little or no alcohol content. (Yeah, less science than the first reply, but there you go...)