extradefs – A miscellany of support macros
The macros work equally in LaTeX and Plain TeX; no documentation is available, even as comments in the file.
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support for development of (La)TeX macros
Maybe you are interested in the following packages as well.
- declare: Declare register names locally
- getoptk: Define macros with sophisticated options
- font-change: Macros to change text and mathematics fonts in plain TeX
- plstmary: St. Mary’s Road font support for plain TeX