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Wrapper around getOption("readr.show_col_types") that implements some fall back logic if the option is unset. This returns:

  • TRUE if the option is set to TRUE

  • FALSE if the option is set to FALSE

  • FALSE if the option is unset and we appear to be running tests

  • NULL otherwise, in which case the caller determines whether to show column types based on context, e.g. whether show_col_types or actual col_types were explicitly specified