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f  A single-precision float in native format.
d  A double-precision float in native format.

...
     (Long doubles are available only if your system supports
      long double values. Raises an exception otherwise.              
+(* WRONG see demo)
      Note that there are different long double formats.)

main::(-e:1):    0
  DB<1> say unpack "B*", pack "f", 1/3
...

  DB<5> use warnings; say unpack "B*", pack "D", 1/3         # NO EXCE
+PTION RAISED
0000000010101000101010101010101010101010101010101010101010101010111111
+0100111111000000000000000000000000000000000000000000000000