[perl #124084] Must initialize num/num32/num64 ?

[jn...@jnthn.net via RT]

On Mon Mar 16 05:09:58 2015, elizabeth wrote:
> my num $a; say $a
> NaN
> my num32 $a; say $a
> 0
> my num64 $a; say $a
> NaN
> 
Fixed, and test in S02-types/native.t unfudged. Also added a load of related 
tests.