[PD] no more Nan display in Pd, why?

[Alexandre Torres Porres]

Howdy, the newer versions of Pd filter out "Nan" in number/atom boxes,
right? Pd-Extended 0.42 and Pd-L2ork still output 'nan' in atom boxes,
btw...

Anyway, why is that? If 'nan' were not allowed in general in Pd, that'd
make sense, but it's only in atom/number boxes, 'nan'is still output and
can be printed...

one thing i dont like about this is that the display will output the last
value instead of an error or a 'nan' output, even though 'nan' is still
output.

check patch attached

cheers
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