Don't forget how this impacts people with caring or parenting responsibilities outside work. It makes sense to want to hire people who are passionate and commit time developing their skills, but using this as a filter makes it much harder for people with limited free time outside work, which is likely to discriminate against people with (for example) young children. If you want to have a diverse workforce, it's important that github history be considered positive but not the only way to prove your skills!
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