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I've very rarely heard of shops running forked, re-compiled runtimes for languages like python or ruby. Normally if you find a bug in the core you might try to

• tinco 12y ago
  There's actually a bunch of shops running forked and recompiled runtimes for languages like python and ruby. I happen to work for a company who maintained such a fork (Ruby Enterprise Edition, by Phusion), and we weren't the only ones who had forks. Most famous were the MBARI patches, made by a guy who worked at MBARI and needed those for running ruby in a submarine or something :P The patches were actually very impressive, despite coming from a biology research institute. (Note that these were forks because they changed aspects of Ruby that were not in line with Ruby's general purposeness, so they were not allowed to merge into mainline Ruby)
  • guelo 12y ago
    OK, but my point still stands since the vast majority of companies are not maintaining their own forks. In the rare situation where they need something special they'll rely on someone upstream, like your company, to fork it for them. Most companies that run into a bug in the core runtime will just workaround it.