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In goodpractice: Advice on R Package Building

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Output
  ── GP badpackage ───────────────────────────────────────────────────────────────

  It is good practice to

    ✖ avoid 'T' and 'F', as they are just variables which are set to the
      logicals 'TRUE' and 'FALSE' by default, but are not reserved words
      and hence can be overwritten by the user.  Hence, one should always
      use 'TRUE' and 'FALSE' for the logicals.

      R/tf.R:NA:NA
      R/tf.R:NA:NA
      R/tf.R:NA:NA
      R/tf.R:NA:NA
      R/tf.R:NA:NA
      ... and 4 more lines

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