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    having some resistor to pull them down have it's...

    having some resistor to pull them down have it's own advantage in case the software goes crazy, if you alter the TRIS setting by inadvertence, or while developing/debugging. Kinda bullet proof ;)
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    There's different school of thought on that, but...

    There's different school of thought on that, but usually what I do is to set all unused pin to input, and tie them directly to gnd. If I feel that I may need those i/o later, I may use resistors or...
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