Integer types: Micro Python runs on 32 and 64 bit machines (and one day

maybe 16 bit), so it's important to use the correctly-sized (and signed)

integer types. The general guidelines are:

- For most cases use mp_int_t for signed and mp_uint_t for unsigned

integer values. These are guaranteed to be machine-word sized and

therefore big enough to hold the value from a Micro Python small-int

object.

- Use size_t for things that count bytes / sizes of objects.

- You can use int/uint, but remember that they may be 16-bits wide.

- If in doubt, use mp_int_t/mp_uint_t.