possible exception: if a function is called ONLY from 'interrupt'
functions using a particular bank, it can be declared with the same
'using' attribute as the calling 'interrupt' functions. For instance,
if you have several ISRs using bank one, and all of them call memcpy(),
it might make sense to create a specialized version of memcpy() 'using
1', since this would prevent the ISR from having to save bank zero
to the stack on entry and switch to bank zero before calling the function
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