Looked at the XS code in Storable module, found that it fails because sizeof(double) is compared with sizeof(long double)
This sounds like a compilation or configuration error to me.
As far as I am aware, the format of perl's native doubles didn't change between versions 5.8.x and 5.10.x. They remain 64-bit IEEE 754 format not the 80-bit long double format. I believe this is also true on 64-bit builds.
Did you build your 5.10 perl yourself? If so, it may be that all you need to do is reconfigure and rebuild to fix the problem.
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