Why do empty strings with integers get converted to zero?

>>> ak.iterable_str_to_array_1d(['', '3'])
array([0, 3])

>>> ak.iterable_str_to_array_1d(['', '3'], dtype=int)
array([0, 3])

This happens for two reasons:

AK_UCS4_to_int64, if given all empty field, returns an npy_int64 of 0; this cannot easily return an error code. Also: AK_UCS4_to_uint64 does the same thing.
AK_CPL_current_to_bool, similarly, treats empty or non "true" values as 0.
When auto-type detection is used, it is the logic in AK_TPS_Resolve that, if previous is TPS_INT and new is TPS_EMPTY, we return TPS_INT; this is the same for TPS_FLOAT and TPS_BOOL.

This is the same for Boolean arrays, where the default is False:

>>> ak.iterable_str_to_array_1d(('', 'true'))
array([False,  True])

possible Boolean parameter names, defaulting to True for now

implicit_empty_int
implicit_empty_bool

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