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I was doing some benchmarking on a base64-encoding routine and was hoping to change it from the form:
  ptr = malloc(large-enough)
  for all data

  init luaL_buffer
  for all data
      if not enough buffer left, luaL_addsize and get new ptr

It turns out that this isn't so nice, particularly when the data size is much larger than LUAL_BUFFERSIZE (on order of 10s of MB)

Has there been any thought on how one could create an arbitrary string- region that one could write to and then finalize? Perhaps even be able to convert a userdata object into a string in place (and freeing it if the string value already existed due to interning)

Another feature that would probably be useful (particularly for string- building) is for userdata to be resizeable...

Any thoughts?