A list of open source contributions I've made; some are small, but it's nice to remember them:

• Rust

  I traced and fixed the cause of a tabular-layout breaking bug in the CSV toolkit xsv.

• C Ruby

  I extended the Range#cover? method in the MRI Ruby standard library to accept other Range objects to allow easy checking for sub-ranges, as demonstrated in the BigBinary blog that introduces new features coming in Ruby 2.6. Later, I fixed a bug in the Rails implementation of the same feature.

• Ruby

  I diagnosed and fixed a crash-causing bug in the pry Ruby REPL when encountering NULL bytes, which included some MRI source-diving.

• C

  I tracked down and proposed a fix for a segfault in the MRI Ruby interpreter when using forked processes and the default psuedo random number generator, as triggered by the Faker test data library.

• Ruby SQL

  I prevented duplicating of jobs and misleading warnings in the Que-web interface to the Que asynchronous job queue.

• Python

  I fixed a bug to ensure table aliases were correctly taken account of when suggesting completions in the pgcli PostgreSQL CLI tool.

• Ruby

  I added and improved several linters of the popular Rubocop code checking tool:

• Clojure Elixir NodeJS PHP Python Ruby

  I fixed a bug, normalised multi-language implementations and improved test coverage of the Mailchecker project that rejects invalid/throwaway email addresses

• Ruby

  I added support for nested constant definitions to the ripper-tags Ruby ctags generator and later gracefully handled unreadable directories.

• Haskell

  I was a core member of the Darcs VCS team, contributing many patches

• Haskell

  I improved certain error messages of the Cabal packaging tool

• Python

  I added support for IPv6 extension headers to the dpkt library, the google code issue no longer exists, but the changelog (now on GitHub) bears my name

• Haskell

  I added an instance to the Boolean algebra library Cond to recognise that Boolean algebras are closed under pairing