# RETRO 2020.4

- bug fixes

  removed an incorrect header stub from rx.muri

  fixed bug in s:index-of-string

- improvements

  lots of size reductions

  increased use of hand packed assembly in the stdlib

  removed numerous variables

  faster performance in rewritten words in the stdlib

- remove deprecated words

  as{ }as " prefix:"

- examplse

  markdown.retro

- future

  underscores in word namesv

    Prior RETRO images had a patch that allowed underscores to be
    used in word names. In this release, the patch is no longer
    part of the standard library, but is still included on Unix
    targets by default. This might affect some users, if you are
    building a custom image, load package/allow-underscores-in-names.forth
    if you need this. This will no longer be loaded by default after
    the 2020.4 release.

  modularity

    Work towards allowing portions of the standard library to be
    optional is ongoing. During this, the internal organization of
    retro.forth is changing and some small parts may be duplicated
    in an effort to allow for more flexibility in the long term.