[Neuroimaging] Nibabel API change - always read as float

[Alexandre ABRAHAM]

> I don't find this behavior to be particularly logical. I guess
> there is a reason the default is 'float'.
>

For example, if the first column is an index, casting it to float makes no
sense.


> Because it is a nice clean file format they control entirely.
>

Yes. So they could have casted all data to float if they wanted to, but
they didn't.


>   I clearly acknowledged that in the next paragraph (which you trimmed),
> and you don't address the fact that is almost always obvious from
> context if the file is a mask/label. It isn't always obvious if an image
> file is going to be float or not.
>

Well the context is also obvious when you load MRI data, just cast it to
float in all cases. And no, it's not simple to pass a dtype when loading a
mask. If an image is contains float values between 0 and 2, casting it to
int will round the values to 0 and 1, ie a valid mask. But clearly, the
file loaded was not meant to be used as a mask in the first place.

Alex.
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