ByteLoader isn't found on any repository. It used to be distributed with perl

$ corelist ByteLoader -a

ByteLoader was first released with perl 5.006
  5.006      0.03
  5.006001   0.04
  5.006002   0.04
  5.007003   0.04
  5.008      0.04
  5.008001   0.05
  5.008002   0.05
  5.008003   0.05
  5.008004   0.05
  5.008005   0.05
  5.008006   0.05
  5.008007   0.05
  5.008008   0.06
  5.008009   0.06
  5.009      0.05
  5.009001   0.05
  5.009002   0.05
  5.009003   0.06
  5.009004   0.06
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