lua.c dolibrary not installing traceback - bug or by design?

[David Manura <dm.lua@...>]

Let load.lua contain this:

  function f() error'fail' end; f()

Running any of these produces an error and traceback:

  lua load.lua
  lua -e 'require "load.lua"'

But running this produces an error with no traceback:

  lua -lload

This occurs because dolibrary in lua.c does not install traceback.  It could do
so if the pcall is replaced with a docall as in dofile and dostring.

Is this behavior intentional?