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Sentimental Versioning:

TeX and Metafont #

by Donald Knuth #

In his seminal text layout system, TeX, and his equally brilliant typeface design system, METAFONT, Donald uses a versioning number system that asymptotically approaches perfection. The version numbers of TeX approach π (the current version is 3.14159265) and the version numbers of METAFONT approach e. It has been prophesied that the last change not be made until after the day Donald ascends to heaven on a shining cloud. At that point, Donald will make one last ssh connection down from heaven to his server at Stanford University and set the version number unto π exactly. At that point all remaining bugs will be declared features, and the output from TeX will remain the same for all eternity.