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Yuck.  It's a bug in not accounting for that rounding can 
spill over the original bit width.  structmodule's pack_float() 
and pack_double() both have this flaw, although the one in 
pack_double() is much subtler.  A similar cut-and-paste 
bug is in cPicke's save_float().  I'll fix all this.

Note:  while "<f"'s result should be the byte-reversal 
of ">f"'s, there's no defined relationship between either of 
those and plain "f".  "f" is platform-native in all respects.  "<f" 
and ">f" force an IEEE-like encoding, even on non-IEEE 
platforms.