To cite package ‘nat.fastcore’ in publications use:

  Schlegel P (2026). _nat.fastcore: Re-implementation of nat core
  functions in Rust_. R package version 0.5.0,
  <https://github.com/schlegelp/fastcore-rs>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nat.fastcore: Re-implementation of nat core functions in Rust},
    author = {Philipp Schlegel},
    year = {2026},
    note = {R package version 0.5.0},
    url = {https://github.com/schlegelp/fastcore-rs},
  }