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Additional Information

Competing Interests

Arfon M Smith is an employee of GitHub, Inc., San Francisco, California.

Author Contributions

Arfon M Smith wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Daniel S Katz wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Kyle E Niemeyer wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:

The research in this article did not generate, collect or analyse any raw data or code.

Funding

Work by D. S. Katz was supported by the National Science Foundation (NSF) while working at the Foundation. Work by K. E. Niemeyer was supported in part by the NSF under grant ACI-1535065. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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